Combining two projects

I have two projects on the same subject. Is there an easy way to put one into the other? Will the files just go under the right heading, ie, research and draft, or will it all go in as one folder?

I would use the File/Import/Scrivener Project... command to do this; merging is the main purpose for this command. It will import pretty much everything about the other project. You’ll want to make sure to copy and project notes separately. The other method is better if you only want pieces of the other project. Simply load both projects up at once and drag the pieces over that you wish to transfer.