Add-ons: sell optional extras alongside packages

Add-ons are optional extras a guest can buy with a package: a birthday cake, shoe rental, a coaching session, an extra 30 minutes. You build each add-on once, set its price, then assign it to the packages it belongs to. Once a package has an add-on, guests see an add-ons step after they pick a time and before checkout.

💡Tip

Add-ons are reusable. Build Shoe rental once and assign it to every bowling package. Tax and fees are set per package, so the same add-on can be taxed differently in different packages.

Create an add-on

Navigate to Add Ons

The Add Ons tab lists every add-on with its type, pricing method, priority and status.

Manage›Add Ons

Click Create Add on

Create Add on is in the top-right corner. The Create Add on window opens.

The top-right corner of the Add Ons page with the Create Add on button above the add-on table — Create Add on is in the top-right corner.

Enter the add-on details

Enter the Add On Name guests see, an Add On Internal Name for your team, the Add On Priority, a Short Description (up to 140 characters) and an optional Long Description. The internal name and short description are required.

The Create Add on window with Add On Name, Add On Internal Name, Add On Priority, Short Description and Long Description — Add On Internal Name and Short Description are required.

Save the add-on

Click Save changes. Rex opens the add-on's page, which has a General tab and an Assign tab.

The Create Add on window filled in with Add On Name, Internal Name and Short Description and the Save changes button marked — Click Save changes to create the add-on.

Fill in the add-on details

On the General tab, click Edit on the Add On Info card to change what guests see.

Field	Description
Add On Name	The name guests see at checkout, such as Birthday cake.
Add On Internal Name	The name your team sees in reports and admin lists.
Add On Priority	The order add-ons appear in for guests. Higher numbers show first.
Add On Short Description	One line on the add-on card, up to 140 characters.
Long Description	Rich text shown when a guest opens the add-on: flavors, sizes, what's included.

On the right, the Add On Controls card has Add On Is Active (an inactive add-on is never shown to guests) and Add On Is Required (guests must add it before they can continue). Under Add On Thumbnail, click Upload Image to set the picture on the add-on card.

Set pricing and quantity

Click Edit on the Add On Settings card.

Choose a Pricing Method

Pick how the price is worked out.

An add-on's General tab showing the Add On Info, Add On Settings and Membership Settings cards, with the Edit button on the Add On Settings card outlined, and the Add On Controls panel on the right — Pricing lives on the Add On Settings card. Click its Edit button.

Flat Rate

Most common

Charges the price per unit, whatever the booking length.

Best for: A $40 cake, a $15 t-shirt

Per Hour

Multiplies the price by the booking's length in hours.

Best for: A $20 an hour equipment or coaching add-on

Set the Price and Add On Type

Enter the Price, then choose the Add On Type that matches what you're selling.

Package Based

Default

A plain line item. The guest picks how many, within your minimum and maximum.

Best for: A cake, a balloon bundle, a souvenir photo

Guest Count

Each one bought adds a person to the party, at this add-on's price instead of the package's per-person price.

Best for: Spectators, non-players, kids

Resource Based

Books an extra resource (a lane, bay or table) as part of the reservation.

Best for: An added lane or table

Time Based

Adds time to the booking. Set Duration (minutes); each one bought extends the reservation by that much. Turn on Add Duration Once to add the time only once, whatever the quantity.

Best for: Add 30 minutes, extra hour

Set the quantity and deposit

Set Minimum Quantity and Maximum Quantity. For Deposit Percentage, choose No Deposit (0%) to let guests pay for the add-on at the venue, or Use Package Deposit to charge it under the package’s deposit rule.

The Add On Settings window with Deposit Percentage set to No Deposit (0%), Minimum Quantity 1, Maximum Quantity 10 and the Save changes button — Set the deposit and the quantity limits, then click Save changes.

The rest of the Add On Settings window is optional. Set any of these, then click Save changes:

Field	Description
Email Notifications (comma separated)	Addresses emailed whenever this add-on is booked, such as your kitchen or events team.
Lead Time (in hours)	How far ahead a guest must add this item. A cake that needs a day's notice might use 24.
Allow Customer Notes	Gives guests a text box on the add-on, such as Happy Birthday Sam for a cake.
Match Guest Count	Sets the quantity to the number of guests.
Match Resource Count	Sets the quantity to the number of resources booked.
Hide Quantity Picker	Hides the quantity from guests. They are still charged for a real quantity: Minimum Quantity, or the guest or lane count when Match Guest Count or Match Resource Count is on.
Hide Price	Hides the price on the booking page, for included or $0 items.
Auto Add Addon	Adds the add-on to the cart without the guest picking it.

Three more cards sit below: Membership Settings (turn on Member Only Addon and pick the Membership Plans whose members can buy it), Categories (group add-ons so guests can filter them) and Revenue Attribution (map the add-on to a revenue category for reports).

Assign the add-on to packages

An add-on shows up only on the packages it is assigned to. Assignment is also where tax and fees are set.

Open the Assign tab

On the add-on's page, click Assign. The table lists every package with its venue, pricing, status and tax. Filter with All Packages or All Venues (one row per venue, for bookings made without a package), or search by name.

An add-on's Assign tab with the All Packages filter, the Search box and the package table with Package Name, Venue, Pricing, Status, Tax and Actions columns — The Assign tab lists every package.

Check each package

Tick a package to show the add-on on it. Untick to remove it. Each change saves straight away.

The package table on an add-on's Assign tab with Birthday Party Package ticked and showing Active, and the other packages unticked showing Inactive — Ticked packages show Active. Each tick saves straight away.

Show only assigned rows

Turn on Assigned only, between the filter and the search box, to list just the ticked rows. It works together with All Packages, All Venues, a single venue and the search.

If an Active add-on is assigned to no package or venue, a red banner at the top of the add-on's page says: "This add on is Active but isn't assigned to any packages or venues, so guests won't see it." Tick a package or venue on the Assign tab and the banner goes away.

Add tax and fees

Tax is set per package, so the same add-on can be tax-free in one package and taxed in another. A tax has to exist on the venue first.

Set up the venue's taxes

Open the venue and click Edit on its Taxes card. Sales Tax (%) becomes the Venue Tax option. Add other rates under Additional Taxes, each with a Tax Name, Tax Type and Tax Amount.

Manage›Venues

The venue's Taxes window with Sales Tax (%), its Included in price toggle, and three Additional Taxes rows each with Tax Name, Tax Type, Tax Amount and Included in price — Sales Tax (%) is the Venue Tax. Add more rates under Additional Taxes.

Open Edit Taxes & Fees for a package

On the add-on's Assign tab, click the receipt icon (Edit Taxes & Fees) in a checked package's row. The Edit Addon For window opens on the Edit Tax tab.

An add-on's Assign tab listing packages with a checked package and its Edit Taxes & Fees receipt icon in the Actions column — Click the receipt icon in a checked package's row.

Choose the taxes

Check Venue Tax for your standard rate, plus any additional taxes that apply. Check No Tax to make the add-on tax-free in this package. Click Save changes.

The Edit Addon For Birthday Party Package window on the Edit Tax tab with No Tax ticked and checkboxes for Venue Tax and each additional tax — Tick the taxes that apply, or No Tax, then click Save changes.

The Edit Fees tab in the same window adds a service fee: click Add item and set the Fee Name, Fee Type, Fee and whether the fee itself is taxed. The Mapping tab links the add-on to your POS or Tripleseat items.

💡Tip

To set tax or fees on several add-ons at once, tick them on the Add Ons list and click Edit Taxes & Fees. The choice applies to every package those add-ons are assigned to.

Let guests customize with modifiers

Modifiers are choices on an add-on: a flavor for a cake, a size for a shirt. Like add-ons, one modifier can be used on many add-ons.

Create a modifier

Open the Add On Modifiers tab and click Create Modifier. Enter the Modifier Title guests see, a Priority, an Internal Name and the Modifier Type, then save.

Manage›Add Ons›Add On Modifiers

The Add On Modifiers tab with the Create Modifier window open, showing Modifier Title, Priority, Internal Name, Modifier Type and a Required toggle — Create Modifier opens the new modifier window.

Single Select

The guest picks exactly one option.

Best for: A cake flavor, a shirt size

Multi Select

The guest ticks any number of options. Each option's price is added once.

Best for: Toppings, optional extras

Quantity Select

Each option has a counter, and its price is multiplied by the count.

Best for: Food and drink ordered for a group

Add the options

On the modifier's page, click Edit on the Options card, then Add Option for each choice. Each option has a Name, a Priority and a Price (0 for no charge). Higher priorities show first.

The Modifier Options window with one option row (Name, Priority, Price and a delete icon) and the Add Option button — Click Add Option for each choice.

Attach the modifier to an add-on

Open the add-on's General tab and tick the modifier in the Modifiers card. Changes save straight away.

The Modifiers card on an add-on's General tab listing two modifiers with Name, Title and Required, one of them ticked — Tick a modifier to attach it. It saves straight away.

⚠️Warning

Minimum Quantity and Maximum Quantity on a modifier mean different things by type. On Single Select and Multi Select they limit how many options a guest may tick. On Quantity Select they limit the total count across all options. Deleting a modifier removes it from every add-on, so untick it on one add-on instead.

Example: Quantity Select

A party of ten orders food with Burger at $5 and Chicken at $5. On Multi Select the guest can only tick both, for $10. On Quantity Select they set Burger to 6 and Chicken to 4, for $50. The counts follow the booking into the order summary, the confirmation email, the dashboard, the Host App and your POS (as 6x Burger).

What guests see

After picking a package and time, guests see your add-ons as cards with the image, name, short description and price. Opening one shows the long description, modifiers and quantity.

Required add-ons are marked Required Add On, and the guest cannot continue until they add them.
If your add-ons have categories, a filter bar lets guests jump to a group.
Member-only add-ons ask the guest to sign in as a member.

Book through your own reservation page to check the add-ons, prices, modifiers and tax look right. To change the order packages appear in, see How priority controls the order packages and tabs appear.

Updated Oct 9, 2026

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