Agents gets comission on two terms: 

Percentage on Total invoice amount. 

Example: 15% comission 

invoice amount=1000$ 

Agency comission is 150$

Percentage on Comission  to GuestJet:

Example: 40% commission to GuestJet commission.

Invoice amount=1000$

GuestJet comission 18% ( vary) =180$

Agency comisson 40%= 180 x 40 /100= 72$

Agents can set comission to sub agents on commission to their comission. 

If you have any more question please contact support team.