Generally you will have 3 options when rates reach their expiration date.
From the main menu, select Rating Setup > Rate Tables
Use the (1) left / right navigation buttons to view each of the rate tables and check the (2) Expire date.
If you are NOT changing the Min/Max or the rates, simply edit the (2) Expire date field to extend the date.
To change the Min/Max and/or rates, click the New Record button (3) and fill in the fields for a new rate table.
NOTE: Be sure the Effective date (4) is the next day after your previous Expire date (2). Skipping days or overlapping dates will yield incorrect results.