Removing stock bridge

I have a bridge within a scenery mod that I want to use. By default it over laps the default one, I have managed to add an exclusion zone around the bridge but all that has done is stop the scenery modded bridge show up but I still the stock one. Can anyone advise how I remove the stock bridge so only the modded one shows up. I’m just getting used to using the SDK kit so I’m not the best at it yet.