If you want to create bulk folders using Google Sheets, this is the perfect tool. The tool is part of the Plus Tools* sidebar.
Create new Google Sheet and add your main folder in column A and subfolders in column B like this example:
Column A: The main client folder name: Client A
Column B: Subfolder structure in the format: Policies A(Personal Policies A.1(Personal Policies – Auto A.1.1,Personal Policies – Home A.1.1),Commercial Policies A.2)
In the sidebar add the folder ID or folder link where you want the folders to be created.
If you don’t add a folder ID, the folders in column A will be created directly in your Drive root.
*this is a paid feature.