How to draw curve with low point at intersecting position of two line in profile view?

Geometrically, I believe that can really only happen if the entrance and exit grades are identical. If the grades differ, the low point of the curve will be offset toward the flatter grade because that end of the curve is "lower" than the steeper end.

Hi MaryB 

I saw the picture on internet as below,

I expect to create one curve with lower point at station of PVI.

Ah, you want an asymmetric vertical curve, where the PVI is offset from the midpoint of the curve length? That's what that diagram shows.

I don't work with asymmetric curves (not allowed here in general) so I can't really help with that. Hopefully someone here does have experience with these, and can help you design what you need. You can also try searching the Help for "asymmetric" to see if it runs anything up.

This video should help.  Basically an asymmetrical vertical curve is a compound vertical curve with two different K values.  Similar to a compound horizontal curve which has 2 different radii. 
(+) Video: Vertical Compound Curve - OpenRoads | OpenSite Wiki - OpenRoads | OpenSite - Bentley Communities

Thank you T T,

I think your instruction is the best solution right now.

Thank you T T,

I think your instruction is the best solution right now.