> For the complete documentation index, see [llms.txt](https://docs.optis.me/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optis.me/product-options/customize-design/how-does-product-option-sku-works.md).

# How does Product Option SKU works?

#### Where to add SKU for OPTIS options? <a href="#id-3-where-to-add-sku-for-optis-options" id="id-3-where-to-add-sku-for-optis-options"></a>

You can add SKU for OPTIS options in here:

<figure><img src="https://storage.crisp.chat/users/helpdesk/website/22429817467a0000/image_1tz39ub.png" alt=""><figcaption></figcaption></figure>

#### How does it work with Shopify variants SKU? <a href="#id-3-how-does-it-work-with-shopify-variants-sku" id="id-3-how-does-it-work-with-shopify-variants-sku"></a>

When customer buys the product with both Shopify variants and OPTIS option, the SKU will show like this:

<figure><img src="https://storage.crisp.chat/users/helpdesk/website/22429817467a0000/image_tld9lf.png" alt=""><figcaption></figcaption></figure>

#### Can I customize the SKU display on cart page? <a href="#id-3-can-i-customize-the-sku-display-on-cart-page" id="id-3-can-i-customize-the-sku-display-on-cart-page"></a>

Yes you can choose to show Shopify variants SKU or OPTIS SKU or both to show with your products in the **Setting > General settings:**

<figure><img src="https://storage.crisp.chat/users/helpdesk/website/22429817467a0000/image_13saurt.png" alt=""><figcaption></figcaption></figure>