From the external site, Workspace Tips:

"Duplicating folders in Google Drive can be a tedious task since Google Drive doesn’t include this feature by default. Fortunately, we have created a tool that helps you copy a folder and all its contents with just a few clicks.

The Copy Folder tool will create an exact copy of an existing Google Drive folder structure and optionally the files within." 

Go to their web site to learn more:

Duplicate a folder in Google Drive