Customizing the metamodel : Keywords for USRPROPS : RENAME SYMBOL
  
RENAME SYMBOL
Enables the use of the 150 User symbols. These 150 user-provided symbols are named User 1 through User 150. You use the RENAME SYMBOL command to rename any number of these user-provided symbols to a new name, thus creating in essence new symbol types. RENAME SYMBOL statements should be listed near the top of the USRPROPS.TXT file.
Example
Rename Symbol "User 10" to "System Requirement"