If I share a form with a sub user can they then clone that form and use

If I share a form with a sub user can they then clone that form and use the clone as their own form, non-linked to my account so that all submissions come to their account and not mine?

They can clone your form and use it, but they have to use their own URL of the form in order for him to receive the submission. If the users use the URL of your form all submissions will be stored on your form.

To follow the instructions on the link below on how to clone a form from the URL:

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

Please let us know if you have any other question.