Draw your line through your project. I'm using an existing CL for the road for this example.
Then choose create alignment, click "Use an existing line" Then tab to the line box and choose the line you drew. You can ignore the vertical on your alignment and just leave the horizontal information.
The click Create Corridor, Name it, choose the horizontal alignment you created, Click ok. Begin station 0+00, New definition. Under instruction type choose "Surface", Click the surface you want to reference in the pull down menu, click Add.
This should generate a surface along your alignment that you can scroll through and look at the profile.
If you want to get more into depth and have the Drafting module you could then generate cross sections along that surface to see them at different station etc.
Let me know if you have any troubles.