I'm afraid I need to write a custom widget for my Entity Reference field and I don't know where to start.
Basically I would like the functionality of the Inline Entity Form for adding new items but with a customized select widget for selecting existing items.
If I could alter or add to the existing Inline Entity Form module, that would be great. I'm just not sure how to do it.
Or perhaps there is a better solution.
Any suggestions would be very very welcome, thanks.