Is there any easy way to renumber waypoint that already exist in a mission,?
No, there isn’t.
For what purpose do you need to re-number them?
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The waypoint numbers do re-sequence themselves whenever you add or delete a waypoint if that is what you are wondering about.
Have a look at this thread:
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Just was curious to put or keep things in logical order and make it easy for others if I share the mission.