When creating a Rebate, either Custom or inside the Rebates Catalog you can record a Dealer Contribution markup.
How does it work?
Specify Contribution in the Rebates Catalog (read more)
Or, when creating a Custom rebate on the Summary page (read more)
Select the option to Apply Contribution if you want to include the contribution % of the rebate in the cost of the proposal
Check Proposal Inspector for any recorded Contribution Markup
Example of Dealer Contribution on when creating a Rebates Catalog:
Example of Dealer Contribution Applied Markup on the Instant Rebate:
Example of Dealer Contribution Applied Markup on the Customer Direct Rebate:
Example of Dealer Contribution Applied Markup on the proposal Inspector: