If an organization would like to apply a rebate program to more than one account,...

According to the Salesforce Manufacturing Cloud documentation, to apply a rebate program to more than one account, you need to add each account to the members related list on the rebate program. This way, you can enroll multiple accounts as members of the same rebate program and track their transactions and payouts. You can add one account at a time, or use an existing Accounts list view to enroll multiple members. You can also enroll an account in multiple rebate programs if needed1. References: 1: Enroll Members to a Rebate Program