Just thought I would check in to see if in RH 2015 you can copy a project folder from one project to another. I was able to use the resource manager to move a topic into another project but not the entire folder.
The way you would achieve this would be to first use RoboHelp to create the desired folder in the destination project. Then you would add the topics.
Would I have to move each topic individually?
Once you get your folder created it should be simple to import many topics at once. Just choose to import, then navigate to the folder and choose the topics.