Well, I found out that I can only use Master Reps in drawing mode, so I created family instances as you all suggested and it worked out fine.
thanks again everybody!
This thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.