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Can I load a previously saved project into the current project?

 
Yes.  This is referred to as importing a project.
 
  1. Open the view representing the group into which you want to import the project.
  2. Select File Import Project... from the menu bar.
  3. The Open dialogue is displayed.  Use it find and select the project you want to import.
  4. Click Open.  The project is imported into the group.
 
Note that an imported project is just like any other feature.  It has no relation to the saved project file from which it was imported.  Any subsequent modifications to the in situ project or its contents are not reflected in the saved version, which remains unaffected.  If you need to save such changes back to the original file then follow these steps.