I have inherited a drawing that has many similar layer names.  For instance: A-wall, A-wall1, A-wallb and in this drawing there is no rhyme or reason for the difference (probably different drafters at different times!)  All I need and want is one of these layers.  What is best way to move the objects in drawing to the one I want to keep and eliminate the unneeded?  Autocad (sorry) has a nice tool that combines layers.