zoho CRM fileds

zoho CRM fileds

This is a two part question
  1. In my Com Request Module I have
  2. a formula filed (gross margin)
  3. In my subform I have a filed commission %
I need to calculate gross margin * commission % input (which is not always the same), but this is not possible because I can not multiply gross margin and commission %

Part two:
  1. is there a way to multiply 2 formula fields in a subform?