--- title: "Add an add-on to a subscription" slug: "add-an-add-on-to-a-subscription" description: "Add-ons enhance subscriptions by offering extra products and services, allowing flexible pricing and tailored options for customer needs." updated: 2026-10-08T07:32:09Z published: 2026-10-08T07:32:09Z canonical: "help.frisbii.com/add-an-add-on-to-a-subscription" --- > ## Documentation Index > Fetch the complete documentation index at: https://help.frisbii.com/llms.txt > Use this file to discover all available pages before exploring further. # Add an add-on to a subscription ## Overview Add-ons let you sell extra products or services alongside a subscription's base plan — from extra user seats to storage blocks or optional services. When you add an add-on to a subscription, you choose whether it keeps the add-on's own price, automatically follows future price changes, or uses a price you set just for that subscription. > **Note** > > Add-ons are different from [additional costs](https://help.frisbii.com/docs/add-additional-costs-to-a-subscription) (one-off, free-form order lines) and usage-based billing products (automated metered charges). Add-ons are predefined products with their own configuration that you attach to a subscription. --- ## When to use add-ons Add-ons are useful whenever a customer wants more than what their plan includes, without moving them to a different plan. Add-ons can be added for the following scenarios, for example: **Team & seat-based extras** - Extra user seats for a team that has outgrown its plan's included quota (for example, 37 additional seats) - Additional administrator or manager licenses **Pre-declared usage blocks** - SMS or email credit bundles purchased in blocks, with bulk pricing for larger blocks - Storage add-ons sold in GB, with better pricing at higher allocations **Optional services** - Personal training sessions added to a gym membership - A premium support package added on top of a standard plan --- ## How add-on pricing works When you add an add-on to a subscription, you choose how its price behaves for that subscription: | Option | What it does | | --- | --- | | **Fixed Price** | The price stays locked to the add-on's price at the time it was added, even if you later change the add-on's price. | | **Flexible Price** | The price automatically follows the add-on's price. If you change the add-on's price later, this subscription updates too. | | **Custom Price** | You manually adjust the price of this add-on for this subscription only, overriding the add-on's own price. | With **Custom Price**, you can also choose a pricing model: - **Per unit** — a single price applies to every unit. - **Per unit step** — the price per unit changes across defined ranges (steps); the total is the sum of units billed at each step's price. - **Per tier** — the total quantity falls into one range (tier), and that tier's price applies uniformly to all units. - **Per tier step** — tiers with their own internal steps, for fine-grained price ramps within each tier. > [!TIP] > **Good to know** > > The **Pricing Calculator** in the Add Add-On window shows a live preview of the total, based on the quantity, VAT, and pricing model you've selected. --- ## How add-ons are billed on the invoice Once added, an add-on appears as its own line item on the invoice, using the add-on's **Name** as the line description. The internal **Add-on handle** is never shown to the customer. Each line shows the quantity, unit price, and VAT rate applied. - If the add-on is billed on a recurring basis, its invoice line also shows the service period (from – to) it covers. - If the add-on uses a **Per unit step**, **Per tier**, or **Per tier step** pricing model, the invoice breaks the quantity down by the applicable step or tier, so the customer can see exactly how the total was calculated. - If the add-on has a different billing frequency than the plan, it's invoiced separately on its own billing date, unless that date coincides with the plan's billing date — in which case it's included on the same invoice. > [!TIP] > **Good to know** > > The **Cost object** you set on the add-on is for internal accounting only and never appears on the customer-facing invoice. --- ## Add an add-on at subscription creation You can add an add-on while creating a new subscription, in the **Subscription options** section of the subscription form. 1. Navigate to **Customers → Customers**, open a customer, scroll to the **Subscriptions** box, and click on [**Create Subscription**](/frisbii/docs/create-a-subscription). 2. Select a plan and adjust quantity or price if needed. 3. In the **Subscription options** section, click **Add Add-On** and choose the add-on to add. 4. In the **Add Add-On** window, choose a **Pricing** option 1. **Fixed Price**: The subscription keeps the add-on's price as it was at the time it was added. If you later change the price in the general add-on configuration, this subscription's price stays the same. 2. **Flexible Price**: The subscription's price stays linked to the general add-on configuration. If you change the price there, it automatically updates on this subscription too. 3. or **Custom Price**: You define a new price just for this subscription, independent of the add-on. Changes to the general add-on configuration afterward don't affect it. 5. Click **Confirm**. 6. Complete the remaining sections and click **Submit** to create the subscription. ![](https://cdn.document360.io/b84e1b5d-2ba6-4465-8c62-fb45a2f31314/Images/Documentation/image-0JPMXRG3.png) --- ## Add an add-on to an existing subscription You can add an add-on to a subscription at any time from the subscription details page. 1. Navigate to **Customers → Customers**, open the customer, and click the relevant subscription. Alternatively, go to **Subscriptions** in the sidebar and open the subscription directly. 2. Click **Edit**, then click **Add Add-On** and choose the add-on to add. 3. In the **Add Add-On** window choose a **Pricing** option: - **Fixed Price**: The subscription keeps the add-on's price as it was at the time it was added. If you later change the price in the general add-on configuration, this subscription's price stays the same. - **Flexible Price**: The subscription's price stays linked to the general add-on configuration. If you change the price there, it automatically updates on this subscription too. - or **Custom Price**: You define a new price just for this subscription, independent of the add-on. Changes to the general add-on configuration afterward don't affect it. 4. Enter the **Quantity** - how many add-ons you want to add to the subscription. 5. Click **Confirm** to add the add-on to the subscription. 6. Click **Submit** to apply the changes. ![](https://cdn.document360.io/b84e1b5d-2ba6-4465-8c62-fb45a2f31314/Images/Documentation/image-2J4X3A3K.png) Once submitted, the add-on appears on the subscription and is included on the next invoice according to the billing options you selected. > [!TIP] > **Good to know** > > To add an add-on that should only take effect on a future date, use [Schedule Actions](https://help.frisbii.com/docs/schedule-actions) instead of adding it directly. --- ## Related - [Add-Ons](/add-ons.md) - [Set different billing frequencies for add-ons and usage-based billing products](/different-billing-frequencies.md) - [Upgrade/Downgrade/Change a Subscription](/upgrade-downgrade-change-a-subscription.md) - [Schedule Actions on Subscription Level](/schedule-actions.md)