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# Create Change Field Files

The Change Fields functions in each application allows the user to change a master code in all applications, such as a customer ID or vendor ID. The information is pulled from the OSFD and OSFH files about which fields are in what files, and what their relative field position is within each record.

If your application contains new codes that you want the user to be able to change, or if your application files contain master codes from existing OSAS applications, use the Change Fields function in Resource Manager to enter those codes. Use the Software Development Utilities Create Change Fields File function to split your changes into the OSFD.xx, and OSFH.xx (where xx is your application ID). Then include these files in the xxSYSFIL.ZIP file for installation. The installation process merges these files into OSFD and OSFH.