You can create subfolders in Socrative by going to the Quizzes tab. Then, select the folder you'd like to create a subfolder in:
Then, click "Add" on the right. From the drop-down menu, select "New Folder":
A menu will appear, and you can give your subfolder a name. Then, click "Create":
Your new subfolder will then appear at the top of the page within your folder:
Creating folders and subfolders is a Socrative Pro feature. Interested in Socrative Pro? Check out our plans here for more information!