If you are working with master planning you can work with multiple plans. If you have a planned order that is generated in a plan then if you run a regeneration master schedule then the planned orders will be deleted for that plan and recreated. If however you want to keep one or a collection of orders before the next master planning run then you can set the planned order to an approved status.
Here is a quick overview.
AX2012 R3 CU9.