hi there,
our shop is not live yet, but as far as our testing goes this app might do the trick for you:
https://apps.shopify.com/deepmine
it is pretty powerful regarding setting up rules for reports to your business partners (= commisions).
your partners can also login and see their current balance, payments made, etc.
it is the only app that is even coming close to anything like a commission management app (which i would love to have!). hope i could help! best T