You can assign a proration policy to a contract, or change the proration policy assigned, either:
To assign a proration policy to an existing contract:
When creating a new contract, you can select a proration policy to be assigned or you can accept the default.
Proration policies are listed on the Proration Policies tab. For more information, see Proration Policies.
To create a proration policy, see Creating a Proration Policy.
Related Concepts
Calculating Actual Day Proration
Calculating 30 Days per Month Proration
Calculating Whole Month Threshold Proration
Adjusting Final Period Value to Remainder from First Period
Custom Proration Calculation Methods
Related Tasks
Assigning a Proration Policy to Multiple Contracts
Reference