> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.optis.me/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How does Product Option SKU works?

1. [OPTIS Product Options, Variant](/product-options)
2. [Customize Design](/product-options/customize-design)

# How does Product Option SKU works?

#### Where to add SKU for OPTIS options?

1. For all the **Text input** options, **Color picker, File upload, Font picker**, you can add SKU for OPTIS options in the **Option settings**:

![](https://storage.crisp.chat/users/helpdesk/website/-/e/9/c/9/e9c9495621c3d000/13b85560-fdbd-4e1f-957f-5de0b0_1mt2soo.png)

1. For all the **Check list** options (except for Font picker) and **Swatch** options, you can add SKU for OPTIS options in the **Option values**:

![](https://storage.crisp.chat/users/helpdesk/website/-/1/4/2/f/142f22f11dba0800/10c06249-20a1-49ca-a19a-b0135e_648quo.png)

#### How does it work with Shopify variants SKU?

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

![](https://storage.crisp.chat/users/helpdesk/website/-/f/a/4/2/fa42af45c5ad1000/ebc620fd-8fc6-498e-999f-f0021e_70hscz.png)

#### Can I customize the SKU display on cart page?

Yes. Go to **Settings > General Settings > SKU setting** and choose the **SKU Type**:

* **Both variants and OPTIS options** (default)
* **Only OPTIS options**
* **Only variants**

Use **SKU Separators** to choose the character that joins the variant SKU and the option SKUs (default: `-`). The preview under the field shows the result, for example `variantsku-sku-sku`.

Adding SKUs to options is available on the **Advanced** plan and above. Date & time options do not have a SKU field.

![](https://storage.crisp.chat/users/helpdesk/website/-/4/6/8/7/4687fd62ca2c7800/b3ee3abd-7a95-4aed-8fdb-9d5a38_1rd569v.png)