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Commission on a Placement is tracked from the Commission tab and can be based on a percentage or flat rate, for up to four Consultants. 
 
Click Placements > find your placement record > Click the Commission tab
 
Consultant 0 is the primary Consultant but the commission can be distributed however you need too.  
 
 

In this case, the Commission is now going to go from 4 Consultants to 3, after the change is made and Save is clicked. Take note of how the Commission Details get updated. 

 
 
The Commission on the Placement is now updated. If necessary this could be done multiple times up until the Placement is Finalised.