Curious if there is a way to show/hide lines on a PO. If a PO has hundreds of lines it would be nice to show/hide lines based on their status (i.e. show all open lines or hide all fully received/billed lines). I assume this would have to be done in a saved search, but that doesn't trigger some workflow and scripts.

I don't believe there is a way to do this on the record itself. You would have to do this by saved search. What I've added on my side to help with sorting is to add a category/color/or some other type to the item and use that as a means for search/sort