I'm using Scmdraft to make a map. I know a simple way to transport units would be through a location and using map triggers. I'm aware that Scmdraft is supposed to have nydus canal linking as a feature. I just don't how how to use this feature.

Does anyone know how to use this in Scmdraft and if not Scmdraft, another program to do so?

You must place one nydus canal, then the next nydus canal you place (of the same player), will be linked. You can see the green line linking them. It is automatic.

Standard Nydus Canal Linking only allows Zerg units to be transported.

Trigger systems can link multiple Nydus Canals, transporting all types of units. Take your pick.

http://www.staredit.net/topic/8307/