As a Roblox developer, it is currently impossible to see specific commission sales on the group revenue page, unlike the user revenue page where commissions are listed (as the image below):
Thanks for submitting this request. It would be great if you could share a bit more about your use case. How are you currently tracking commission sales done in a group today? Are there any workarounds?
There is currently one work around and that would be going into revenue stats and downloading, however this does not give a live feed of commissions. Tracking sales in-game is what I do currently to see it.