TextGrid : Using the Aggregations Editor

To create a reference to an Object in an Aggregation, Collection, or Edition, use the Navigator to drag it from there and drop it in the tree shown the Aggregations Editor. You can see which Edition an Item belongs to in the Navigator tree or in the “Part of Edition(s)” field in its metadata application form. Save the changes by using [Crtl+S], the  icon in the toolbar or “File > Save” in the menu bar. Otherwise a dialog box will open that reminds you to save changes if you quit the Aggregations Editor.