I have items in a grid, e.g. ToDo,  that I want to quickly make subitems of contacts (items) in the addressbook.
I created a new text field, contacts, with a list of pop-up items using the items in the addressbook.
I can now select the contacts from the addressbook in the Contacts field.

However, that does of course not make the items subitems of the contacts in the addressbook.

I wonder if it is possible to create a script, something like this:

If contacts = Addressbook-itemText then make ToDo-item subitem of Addressbook-item