I'm trying to figure out how to create gateways and bridges (similar to in the Campaign and Multiplayer maps) to enable for more accessible regions of a map as well as to enable for more variation in how to play each match on such maps, but I can't find any tutorials or guides as to how to create these small events.

Is there anyone at all who would be able to give me a little bit of insight as to how to create these featuers?

Thanks! :D