I've got a group of sub-users and I want to share a theme I've created

I've got a group of sub-users and I want to share a theme I've created with them. How can I send the theme or place it where they can access and apply it to a new form?

You can do that by adding a Theme to our Theme Store: https://www.jotform.com/mythemes.  Click on "Publish on Theme Store" when you are done creating your theme:

To use the theme to the other forms:

a. Just go back to My Themes: https://www.jotform.com/mythemes

b. Click the design and click "Use Theme"

c. Select the form from your Forms list

d. Click "Install Theme":

Other users would need to search for the theme.  It should be available if set to Free.