Pick a point on your alignment that is past any changes you are about to make. Mark it with a point or circle. Make changes to your alignment before this point. Then, go to Alignment Properties > Stations and make that point or circle the same station as it was before the changes were made. Everything past that point in your alignment, profile, and corridor will revert to where it was pre-changes.
This may not work so well for alignments that are miles long, but it will save adjustments past your alignment revision area. Also, it may make stationing before the change area different. (e.g. negative stationing if you began at 0+00, or 9+50 if you started with 10+00. You should be able to live with this.)
Not perfect, but certainly saves some time.
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