If the Surround SCM operation you want to perform is not covered by the built in FinalBuilder Surround SCM actions, then you can use the Surround SCM Generic action. The action requires you specify the SCM Command, the working folder to run the command from, and the command line to send to sscm.exe.
See the "Surround SCM CLI Guide.PDF" file for more information on the Surround SCM commands and command line options.