Is there a way to set commissions based on Suppliers and what we sell ?

[L. Brett Sinclair]

Say Supplier S1 have 3 products S1P1, S1P2,S1P3.  I want to be able to give a commission to S1 but only on the 3 products he supplies regardless of the buyer and what the buyer buys.
Same with S2 and S3 for ex. 

So, If a buyer buy 1 (one) S1P1 and 3 (three) S3P2 :

Supplier 1 will get a commission for his P1;
and the Supplier 3 for his P2 (times 3 because the qty=3)

Thank you

PS: Same logic could be apply for a Brand. I can modify my product line to be by Brand and offer a % commission on 1 supplier for 1 brand.

Edited September 8, 2021 by L. Brett Sinclair
added a PS for Brand (see edit history)

[L. Brett Sinclair]

How would you guys pay a % commission fee only when you sell a product and only show a summary each month of what's being sold from that supplier? (or Brand)