Hi Haris (again),
I have been working on (re-)implementing ModelCHECK recently and this is something I have had to do.
There is a PTC case regarding this (CS33856).
Essentially add the following into your "start" file (".mcs" extension):
<mode>_PARAMETER <param name> NONE EQ PDM
Where,
mode: "PRT", "ASM" or "DRW" depending on the file type the parameter is on
param_name: the name of the parameter to designate
e.g:
PRT_PARAMETER Weight NONE EQ PDM
Regards,
Toby