You can add own fields to the cost center master data. The following SAP enhancement is available for this purpose:
COOMKS01 Cost Center: customer-specific additional fields in the master record
This enhancement includes the following enhancement components:
Unlike modifications, enhancements are compatible with any release because they are not part of the SAP original and reside in a namespace reserved for the customer.
Information on the procedure when using enhancements can be found in the enhancement transaction CMOD under "Utilities -> Online manual" in the section "Function Exits".
For more information on the enhancement, refer to the documentation of the enhancement. You find it in the CMOD enhancement transaction by choosing "Display SAP documentation".