Thanks for those detailed steps! Having used eclipse for a long time for Java development, I wanted to create a new, clean project after our sample robot code got a little out of hand after renaming files.

So to have the steps for a non-Java project for an embedded system there like that really helped.
As for getting an existing (copied) project into a workspace, you can right-click in the Project Explorer, select Import..., then select to expand General, and then select Existing Projects into Workspace. Point it at the base directory of the project, and it will pick up the project file with the settings, and bring it all in to the workspace.
Hope that helps!
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