You can specify system symbols in SMFPRMxx. In addition, you can specify the &SID symbol when naming SMF data sets (on the DSNAME parameter).
For information about how to use system symbols in shared parmlib members that require unique values, see Sharing parmlib definitions. For specific information about using symbols to name SMF data sets, see the description of the DSNAME and SID parameters in the description of this parmlib member.