Sure -- create a project or global script function like this:
Code:
Function AppendShortName(macroName)
AppendShortName = vbld_AllMacros().Item(macroName & vbld_AllMacros().Item("SHORTNAME").Value).Value
End Function
And then use like so:
[AppendShortName("TESTPCUSERNAME")] -pw [AppendShortName("TESTPCPASSWORD")] "%BUILDDIR_RND%\Setup\*" [AppendShortName("TESTPC")]:[AppendShortName("TESTPCDIR" )]