Adding stop disc MH and stop disc FH of same supplier

dear all,

please let me know how to add stop disc MH and stop disc FH of same supplier in mould base definition file.I will save this assembly definition file for reuse. I will use different types of part (model)  for stop disc MH and stop disc.

when I am downloading the preset mould assembly (what I configured) I can see only top disc MH in my mould assembly. stop disc FH is missing. am I doing something wrong? please advise. I am using emx 13.0.0.0