modified flooring

[giro_mary]

Bye to all,
I am making an outdoor accommodation, in particular the jet of an insole on a sloped ground. I designed my insole and used "modifies secondary elements" to align it to the inclination of the existing soil. My problem arises when I have to enter the quotas, I can only enter those on board, but I would also need to have inside the area. Where am I wrong? Thank you.

 

[giro_mary]

I solved by creating a topographic surface above the insole and listing that...but it seems like a "accrocchio", although for my purpose it is enough. Maybe someone can tell me a better way. Thanks