Different commissions by vendor type?

Hi,

I am going to have two types of vendor on my marketplace.

1) Vendors who will supply just a design, which is then produced by a print-on-demand company and distributed. The vendor will not have to pay for raw materials or shipping costs etc

2) Vendors who will make and ship the product themselves. These vendors will incur higher charges than type 1 for producing and distributing their products.

I have set these two vendor types up as ‘groups’ on WCFM (see screenshot)

Vendors will choose which type of vendor they would like to be using a custom field in the registration form

I would like to have two levels of commission, depending on the type of vendor:

1) 30% commission
2) 10% commmission

Could you please let me know how this can be done?

Thank you,

Alastair