Step 1:
Go to Menu > Custom Forms and pick (or create) a custom form that you would like to save as a template
Step 2:
Select the Revision of the custom form that you would like to create the template of
Step 3:
Click on the Save as Template
button in the control header, give it a name, and hit Save
Step 4:
Find the template in Menu > Custom Forms > Templates
That's it, you are done!
-- Cogency Team