Question regarding Work State & Work City

We are bringing on a third party LOA administrator and one of the requirements for our reporting is to report the work state and work city for our employees. I know that I could easily set up a category code to accomplish this for reporting, but those are very valuable real estate in the Employee Master. Based on preliminary digging, I have found the WKSE (Work State) and LWK1 (Work City) fields under the Payroll task view in the employee master. The F1 descriptions on the field talk of use in calculating taxes for payroll. Is there another flag in