Creating a mass or topo those bottom points follows a linked floor

[Deniz_Maral]

Hello guys,

I would like to create a solid, mass or topo it does not matter. It has to work as embankment. It should be in triangle form and top point can be fixed because it hase value of 146,31 but other two points should follow the linked floor, which has different Z values. I created a topo surface but the base height is there constant.
Please take a look at pictures.

[Deniz_Maral]

I got the floor geometry in Dynamo but I don’t know how to go further. Could you guys please help me?

[Deniz_Maral]

I solved the problem, I created a void from a linked floor and then cut the family