It is legitimate to have a single drawing that acts as more than a just one drawing type. A good example is to start with an existing item from any one of several different suppliers (see Vendor Item Control Drawing), screen the parts to get only the really good ones (see Selected Item Drawing), then tweak them by drilling some mounting holes (see Altered Item Drawing), leaving you with a part that can be used in place of the original, but not vice-versa.
This can all be done on one drawing, if you’re strong enough.