Click the File Locations tab of the Options dialog to set paths for files and directories.
Files and Directories
Default template file:
Specify the path for the default template file. The Revit Architecture installation automatically sets this path; however, you may want to change it if you need to use either Imperial or Metric units for your project. There are default templates installed in either Revit Architecture\Imperial Templates\ or Revit Architecture\Metric Templates. Select whichever one is appropriate. Also, you can change this path to point to a custom template to use for all your projects. Just click Browse and pick a new one.
Default path for user files:
Specify the default project path where Revit Architecture saves the current file. This setting overrides the default path for saving files. When you specify a folder, Revit Architecture opens that folder by default when you save or open a file.
Default path for family template files:
Specify the path for the templates and libraries. The Revit Architecture installation automatically sets this path; however, you may want to change it if you need to use either Imperial or Metric families for your project. There are default templates installed in either Revit Architecture\Imperial Library\ or Revit Architecture\Metric Library.
Add secondary libraries that may be specific to your company. To do this, click Places. In the Places dialog, enter the library name, click in the field for Library Path, and click the browse button. Navigate to the appropriate folder, and click OK.
Each of the locations above can be edited to whatever you want.
Click the “+” sign to add you own. Notice the HMC Library (which was added for my firms files).
You can move search paths up and down as needed with the buttons on the left.