What-If Road Mapping Merged

I would like to be able to have my main roadmap, which is my current approved direction.  I would then like to have X additional copies of my roadmap that are hypothetical directional changes.  I may or may not use them, but I need to create them for analysis somewhere (presently on paper).  This new hypothetical roadmap uses some of the same epics and features as the main roadmap but not all of them and would use additional epics and features that are not in my main roadmap.