> For the complete documentation index, see [llms.txt](https://options-docs-v2.avisplus.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://options-docs-v2.avisplus.io/get-started/key-terminology-simplified/add-on-product-add-charge.md).

# Add-on product (Add charge)

The **Add-on product** feature allows you to automatically apply an additional cost based on the customer's selection of an option value. When this feature is enabled, selecting a specific option value generates an additional charge that increases the product's total price. 

This is useful for options that come with a price increase, such as premium materials or custom features. The **Add Charge** ensures that the additional cost is applied seamlessly during the checkout process, reflecting the total price according to the customer's choices.

{% hint style="info" %}
[How to set up Add-on product (Add charge) for your options](https://options-docs-v2.avisplus.io/app-features/up-charge-for-specific-variants)
{% endhint %}

<figure><img src="/files/icfn1Zg3i4kETVdZKlxZ" alt=""><figcaption></figcaption></figure>


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