Side Slope & Vertical Design?

Working on a new project with an alignment that has three vertical alignment. The left, right and baseline vertical. I was going to create my EOP 3D linestring using the side slope. Which I had high hopes thinking I could somehow reference the left and right. (Just now had the idea of switch verticals and doing side slope, so much work.). I did not see any option to reference. I then was going to try the vertical design and was a bit lost.
Any one ever use side slope or vertical design with an alignment that had more then one vertical alignment? Any other tips. Lucky for this project the three verticals only had VPI. Making it easy to elevate the EOP lines from the baseline.