If you are entering the same company or contact as commission for each deal then it is useful to setup default commissions.  Default commissions will allow an Admin to create contacts for a commission with a simple press of a button.  To setup default commissions, navigate to the Commission Configuration page under Admin > Setup > Commission Configuration.

To add commission defaults, simply type in the company and/or contact, choose Payable or Receivable in the dropdown and then click the Add button.   The default will appear as row below.  To delete a default simply press the trash can icon next the line item.

To add the defaults to the deal, navigate to the Deal > Commissions page and click Add Defaults.  Note this button will only appear if you have at least one Default setup AND there are no existing commissions on the deal.

After adding commissions, the Add Defaults button will disappear.