CORRIDOREDIT command
Adds or removes regions for a selected corridor.

Method
There are two methods to use CORRIDOREDIT command:
- Add regions for a selected corridor.
- Remove regions for a selected corridor.
Options within the command
- Add Region
- Allows you select a template for a selected corridor.
- Enter region start station
- The starting point along the 3D alignment line.
- Enter region end station
- The ending point along the 3D alignment line.
- Remove Region
- Select region to remove.
- enter Index
- Select index to be removed.