We use bundles heavily so almost all the products in a quote are members of a Grouped Bundle. When a Project is sold I will run a management report that aggregates all the Items of a specific ItemType across multiple quotes within a given project. I want to know what group each item is a member of by listing the Manufacturer Part # of the relative GroupHeader.
I don't believe this is possible with native functionality.
There's nothing that really links a group member to a group header in the DocumentItems table in the database.
Best that could be achieved, and would do what you want with no user interaction, is a custom script.
When I click save, copy the Part# of the group header to a spare Custom field for each of the relevant group members.
Thank you for your response. I think that would probably work. I will look into it.