> For the complete documentation index, see [llms.txt](https://wowapps.gitbook.io/wowbundle/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wowapps.gitbook.io/wowbundle/features/checkbox-upsells.md).

# Checkbox Upsells

Show an optional product below your tiers. Customers tick its checkbox to add it to their order.

## How to add a checkbox upsell

Open **Offer** and scroll to **Extras**.

1. Turn on **Checkbox upsells**.
2. Choose the **Product**. Use **Change** to replace it.
3. Enter the percentage in **Discount**. For example, enter 20 for 20% off.
4. Click **Save**.

![Checkbox upsells enabled with Transit Pouch selected and a 20 percent discount. The preview checkbox is unchecked.](https://509262307-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2ForO5ObmoZj39Yv9npS3w%2Fuploads%2Fgit-blob-36bb9cc9cd68086ff7d58ccc22fca986fac269a9%2Fcheckbox-upsell-controls.png?alt=media)

Use **+ Upsell** to add another optional product.

## Customer choice

The checkbox starts unchecked. Customers can choose a variant, then tick the checkbox to include the extra product.

To attach an extra product to one tier, use [Tier Upsells](/wowbundle/features/tier-upsells.md).