So I recently downloaded the B&M custom supports but when I try to use them I cannot seem to have the original support of the ride disappear. Anyone know how to do it?

Well, I never used custom supports in RCT2, but I have an idea which I use in RCT3, it may work in RCT2. Simply place a cheap scenery item underground, (directly under the original support, of course) then, it would act like a path, piece of track, under the support, etc. essentially, "deleting" the original support. However, on most occasions, the support just changes, the lateral support connecting to the track extends and changes direction, so the original support can still "exist". But when that happens, just keep placing those scenery objects underground, beneath the support, util the original support disappears. I hope that is not too confusing. (I recommend the scenery item being a size of 1x1 or larger)

Nope, I completely understand! I will give it a shot. Thank you!

The supports will stay....the game just recognizes it as something underneath it (like land or a tree) and they just move to the side. You could out something directly underneath the track at the very top of the support to make them disapear, and then build the custom supports then.

Get Object Editor and Save a Blank Object as a Support Blocker! Make sure it is no walls/roofs

__________________
o hai. i herd u liek mudkipz?