Detach Terrains in SS4

I am a new-ish SS4 user.  I have completed one project in SS4 and am starting my second.  It is a 20 mile widening project.  I ended up with multiple terrains in my design  file and am unable to remove/detach them.  My corridor is running slow, which I expected, so I planned to split it into more than one corridor, but I want to clean it up before doing that.  Can you direct me to the correct tools to detach terrains?

Do you have a recommended strategy to manage files with this length of project?   My end conditions are simple.  I am hoping to use just 2 corridors, each 10 miles long.  Would reducing the limits of my terrain help?

BTW, I am unable to ask a question when using windows explorer.

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