When resources you’re about to add to your project plan get paid the same hourly rate, you can save time by letting Microsoft Project enter the standard and overtime rates for you. You do this by specifying default standard and overtime rates before you enter new resources.
These default pay rates apply only to the resources you’ve added after you enter the rate. Thus, you can specify a different default pay rate for each new set of resources. For example, you can specify a default pay rate, which Microsoft Project applies to the next set of resources you add. Then, you can change the default pay rate, which Microsoft Project applies to any resources you add but not to the first set of resources.
To assign a rate to a resource