Differentiate between suppliers- two sites

Our company has two locations, only one of them is working toward ISO certification (call them site A) the other is not (site B) and doesn’t need to be for the industry it services. I keep running into the issue of site B wanting to by from suppliers that cannot be approved in our current system at the certified A site. Is there any way inside Kinetic to differ between suppliers approved for our site A facility and suppliers that our site B facility uses? I can certainly just check and uncheck the “approved” box for every purchase at site B to ensure no site A purchases occur with that supplier but this seems cumbersome and open for human error. Any suggestions?
Thank you!

A single purchase order in Epicor can have releases for any site in the company… so out-of-the-box there is no way to do what you need.

That said, this could be accomplished via BPMs… but the devil is always in the details.