Use this procedure to create a new category in the Drawing Explorer.
On the Quick Access toolbar, click Project Navigator .
Navigate to the tab for the category type you want to create.
If you want to create a sheet category, click the Sheets tab, and click (Explorer View).
To create a category under an existing category, click the existing category in the tree, and create a new subcategory using either of the following methods:
Right-click, and click New Category.
Click on the toolbar at the bottom of the tab.
Enter a name for the category, and press Enter.
You can now add project files to the new category.