Hi, thanks for getting in touch with us.
The default flow is such that
Hi, The commission flow works on the basis of priority levels.
First Priority: Product-wise commission, Second Priority:Category-wise commission,Third priority:Vendor-wise commission & Fourth priority: Global commission.
Now in order to set vendor wise commission in your site go to WCMp>Vendors>Choose a Vendor>Click on edit>Payments>set the commission (here is the screenshot- https://prnt.sc/rf5XoUS3g2yT )
For further details refer to this link: https://wc-marketplace.com/knowledgebase/how-to-setup-wcmp-commission/#nav-5