I typically make a copy of some members to test different loading scenarios but sometimes your moving quick or there is a lag on the server where loads get accidentally deleted. Having an Undo/Redo option for changes in loads or changes in spans would be ideal. I would imagine that in each tab (Spans & Supports, Loads, Holes, & Location Analysis) there would be an Undo/Redo button that can essentially undo/redo infinitely for that particular tab per member.
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