Create a new Pay Policy:
Go to Definitions => Pay Policies => Add New Pay Policy
To assign the new pay policy to employees:
Go to Tools => Bulk Trans
Navigate to the Change Status tab
Select new policy that was just created
Select ALL employees that you would like to assign to the new pay policy
Assure that the correct data is used for all other fields
Click Apply
NOTE: If backdating the new pay policy, make sure to reprocess the data from that date.
Go to Tools => Reprocess
Select the relevant employees
Select the correct date you want to backdate to and click Apply