I'm using Geopak, so this may not apply to you directly, but it sounds like you need a template (probably using the CL as the corridor's baseline) to do some of the following:
1. Find the lateral position of the ES. (You can do this by specifying the offset in the template or by attaching the ES line as a reference.)
2. Find the vertical position of the ES at the appropriate offset.
The second is apparently what you're having trouble with. Someone else could help better if you explain exactly how you're using it and what response you're getting in the model.
As for what profile to use on the corridor model for the template drop, you should be able to use any profile attached to the CL. Any profile that exists over the range you're interested in, anyway. And for that matter, you could specify the existing profile.
1. Find the lateral position of the ES. (You can do this by specifying the offset in the template or by attaching the ES line as a reference.)
2. Find the vertical position of the ES at the appropriate offset.
The second is apparently what you're having trouble with. Someone else could help better if you explain exactly how you're using it and what response you're getting in the model.
As for what profile to use on the corridor model for the template drop, you should be able to use any profile attached to the CL. Any profile that exists over the range you're interested in, anyway. And for that matter, you could specify the existing profile.