Make Pay Rate Groups based on how you classify resources for payment purposes. For example, if you use a tiered system with different pay scales for different levels of experience and credentials, or if you pay different resources different percentages of billable items, create groups based on those classifications.
After setting up a pay rate group, create its related pay rate tables and attach resources to the group. Each Pay Rate Group can have an unlimited number of pay rate tables, so create as many pay rate tables as you need.