How to undo edge split but still keep the hard edges (Text tutorial in description)
This is a quick no commentary tutorial on how to undo already applied edge split on a model but keep the hard edges to make working on a BeamNG model easier.
Text tutorial:
Go into edit mode
Switch into edge select mode
Find and select an edge that has had edge split applied
Press 'Shift+G' and select 'Amount of faces around an edge'
Press 'Ctrl+E' and select 'Mark sharp'
Switch to vertex select mode
Go to the top menu tabs
Select the mesh tab
Go down to 'Clean up'
Choose 'Merge by distance'
Add an edge split modifier
Uncheck the 'Edge angle' box
For doing this to multiple objects at the same time:
After you complete all the steps above, go to object mode
Select all the objects and have the one with the modifier selected as the active
Press 'Ctrl+L' and choose 'Modifiers'
Hope this helps!