facing some challenges while using Open Road designer

Mentioning the challenges here with:
1. How to change certain locations/ alignment at ground level by taking reference of x,y, or chainage? 
2. How to change the centerline?

3. How to maintain or design an exact certain level /ground level in vertical profile after knowing the chainage & curve length? 
So request you to please provide me the solution for the same.
Thanks & Regards,
Prabina Kumar Satapathy.