Inline entity form prepopulate
Please try Entity reference autofill with Entityreference prepopulate Module.   


Add an entity reference field in your entityform.
The entity reference autofill will automatically fill reference value into field. We can load default value from URL. (?field_name = value)
Entityreference prepopulate will prepopulate the values. (you have to add existing fields for that.)


Hope this will help you.