When we highlight an object for example lets say a player re-spawns. If I highlight the re-spawn and hit the key “DELETE ALL” it will delete all the re-spawns in the map.
We had this feature in Reach. Can we PLEASE have the option on Halo Infinite Forge?
Peace 
You may be better off adding your feedback to the feedback thread:
https://forums.halowaypoint.com/t/official-forge-feedback-thread/553696
I think there’s a way. I’m not at my console to look but I think in the files tab section you can find each specific item and there’s a way to select all and delete but I can’t give you the specific instructions. I quit forging because all the problems. At least using xbox 1 invariably maps render mostly black and are unworkable. Manual sizing and undo/redo functions don’t work most of the time, either.