> For the complete documentation index, see [llms.txt](https://ymq-app.gitbook.io/ymq-product-options-app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ymq-app.gitbook.io/ymq-product-options-app/faq/sku.md).
# sku
Since shopify does not allow to modify the sku of the product, the app will generate a virtual product to carry the sku information.
For example:
The sku of the product is: sku 1
At this point there are 2 app options, namely
test A, option value: a1,a2, sku: a1,a2
test B, option value: b1,b2, sku: b1,b2
If the customer chooses a1 and b2, Then the final sku is sku 1-a1-b2
The link symbol "-" in the middle can be customized
For details, please refer to the figure below
**shopify variant sku**
**app options sku**
**Product page display effect**
**Shopping cart page display effect**
**Checkout page display effect**
**Order display effect**
**SKU splicer**
