I may be thinking a bit too far here- but is there a way I can merge the steps of one project into another?
So we can answer this better I could do with an understanding of what exactly you are trying to achieve. Would you be wanting to merge the steps of one project with another that is a different assembly?
Yes, is that possible
The only way you could do that is to copy an existing project, and then use the addin to update it with a different assembly. However, I would expect issues as none of the parts would match correctly. You may be able to sort it if you are using the SolidWorks adidn, as that has the ability to match missing parts, but it wasn’t really designed to be used for this purpose.