Yes, you can do this by creating Subcollections to further organize your files in your Videos & Files, and Exemplar Library.
Go to your Videos & Files page and scroll to the Collections list on the left. Use the gear icon to open the Collections Management screen.
When you hover your mouse pointer over the title of a Collection, you'll see the options to Delete and + New Subcollection appear.
To create a Collection inside another Collection, click the '+ New Subcollection' button, then give your Subcollection a title. Use the blue checkmark to save your new Subollection. Then click 'Save,' or the white 'X' button, to return to your Videos & Files page
Rather watch a video? Here's our tutorial on how to create a Subcollection.