You may want to first ask for a copy of your job description from Human Resources. Compare your job with what is written. If there is a big discrepancy, you need to talk with your supervisor to see if these are permanent changes in your responsibilities. If so, you would want to fill out a PDQ form (position description questionnaire), which can be downloaded through the University Human Resources (UHR) web page on OU Forms. This needs to be approved through the highest level of your planning unit before it is submitted to UHR.
Your position may be re-evaluated to be either a promotion or change of administrative pay grade. Salary increases are retroactive to when they were first submitted to UHR.
Call the University Human Resources if you have questions about this process. You can read more about this in the OU Policies and Procedures, Administrative and Professional Pay Plan (40.036).