How to make that: "Model template"?

I am not sure for what I must search to find what is behind this feature: There is an additional menu item to create a subtree:

Is there a doc about that feature?

Hi, it seems this is the relevant doc https://help.fibery.io/en/articles/3135770-context-views

ok thank you!

The given document does not show where the default items come from when e.g. using it with “Product Management”. If I enable it for another item, it is simply empty.

Oh I found it:

2020-07-24 09_08_22-Posteingang - Andreas.Hernitscheck@bol-systemhaus.de - Outlook