how to share folder

If you're asking how you can share your Folders to another JotForm account(Your Sub-user's Account), you can refer to this guide and follow the steps to do so: 

How-to-Share-Forms-with-a-Sub-Account-User

Or

Then,

You will be redirected to your Account Profile and under Users you will be able to share Folders to your Sub-User's account. Click "edit" on the right side of the email address of your Sub-user.

I hope this helps. Let us know if you need any further assistance. Thank you.