I would like to try to make a drawing with several version of some
items on it.
Let say that most of the drawing is common for all version. But some
portion of this drawing is different in earch version.
Is there any method of hiding some blocks or groups?
I could use layers for this purpose, but what to do if all options
contains some blocks put on different layers? In this case it will not
I cannot also use underlays becase I would like to have a possibility
of editing these versions.