Is it possible to specify an exception subclass for the Exception objects created by CATCH TO statement?

In other words:

local myException as myExceptionClass

try
  code here ...

catch to myException as myExceptionClass
  error handling code 

endtry

Or (as I suspect), CATCH TO only creates objects of the base Exception class?

If so, is there any scenario wher eit makes sense to subclass the base Exception class?

Thanks,
Malcolm