How does Vendor Performance works?

Summary:

We want to implement Quality processes during the pre-receiving process and would like to understand how we can do quality processes in WMS

1. Random Quality marking - I can do this flow end-to-end, so no problem here.
2. Automatically mark a certain percentage/quantity for Quality based on Vendor/Item/after every 3rd/4th number of PO? - This I am not able to understand, and there is very limited documentation on Vendor performance, which I read and was not able to make this work.

If anyone has any points or documentation, or can help me understand what we can do in terms of quality checks in WMS?