I just discovered that I've lost many sub-items that I thought were assigned to multiple parents.

1) Start with an item and sub-item in one grid, and a 2nd item in another grid =

2) Assign Sub-item to grid-2.  This grid now has two top-line items =

3) In grid-2, move "Sub-item 1" underneath Parent-2.  Note that sub-item loses its assignment to Parent-1 in grid-1 =

Is this the way it's supposed to work?  I don't understand the logic of removing the item from grid-1.  Why would it lose its parent assignment there when its moved under a parent in a completely different grid?

Wayne