Hi Charlie

>>Use optimitic table buffering so you can change records without firing tableupdate(). Then update all at once.
<<

I rarely use anything but optimistic table buffering.

>>I would use relations, but don't couple your grids directly to a table. Instead, I would use list controls and bind to an array then populate lists from array using list functions. Binding data directly to a grids or lists can can cause headaches.<<

Relations would require me to add index tags and these tags would get seriously complex if I wanted to support reordering the child and grandchild. I haven't seen any problems binding data to grids (thanks to Drew and VMP), so I can't justify adding extra code to maintain the lists' array(s), move the data to and from the lists etc.