This is what I call "a proper explanation". Many thanks @RDAOU
I just have one question regarding the process you've described. Why do you need to create a masking region for the COURSE scale? Is it not sufficient to simply draw the outline of the mullion profile, which is part of the profile family anyway? I then get the point about adding a masking region for the MEDIUM scale as you are showing with the grey hatch in the video and obviously the CAD info from the manufacturer for the FINE scale. But I don't get why you'd need a masking region also for the COURSE view...
To recap, in terms of families I need to use, would it be as listed below?
1 x mullion profile
1 x detail item > masking region COURSE - or maybe not (see query above)
1 x detail item > masking region MEDIUM
1 x detail item > masking region + cad info (imported?!) FINE
Once loaded all the above families in to the main profile family I'll then edit their VG settings (course / medium / fine). Is that correct?
With your suggestion to use a masking region to hide the actual profile in COURSE scale (if needed), do you confirm that it isn't possible to hide the actual profile no matter the VG settings we input within the profile family? Am I getting it right?