That is good advice and I using worksets such a thing you recommended. I see problem in Revit when creating content, especially when creating drop down lists inside family. I hope pictures I posted earlier makes more clear what I mean with custom categories etc.
At the moment stairs, railings and curtain walls having quite nicely some subcategories and it helps a lot to make content for them.
Other thing that certain categories are totally missing, like Roof accessories (snow barriers, rood bridges...), Rainwater systems as own category and could have subcategories like gutters, drainpipes etc. Fireplaces and chimneys doesn't have own category, just couple to mention.
All this cause that soon having many totally different content for example inside Generic Model- category, for example having roof accessories, fireplaces and rainwater systems in same category.