platform connection with scale

[kubbah]

Hello I would like to ask you what the best procedure is for collecting a ramp with a ground through a staircase

Thank you.

in the image with yellow is the desired effect

 

[frcprogetti]

modeling in-place

 

[kubbah]

Any more details? :
thanks in advance

 

[frcprogetti]

so without the file is a little difficult. . .