Say I have 2 content types "Artist" and "Biography". I can use Entity Reference to link one Biography with one Artist (it's a one to one relationship).
Now when creating a new Artist, can I have a tab or a link to add an artist biography directly, instead of having to create the artist first, then the biography, and link it with an artist?
Thank you.
I don't know of one for Entity Reference but if you can swap that out in favour of the References module you can use References dialog which would be suited to your use case:
If you're changing to a different relationship module, there's also the Inline Entity Form module which:
It embeds the add/edit form for the referenced entities into the primary entity's form so you can create multiple related entities from the same page. It also has support for nodes built right in.