Walls not attaching to sloped floor (Revit 2024 API, C#)

[F_Bgdh]

Hi,
I'm facing an issue with the Revit 2024 API. The image below illustrates the problem:

I’m applying a slope to the lower floor using a SlopeArrow. After applying the slope, the two side walls no longer attach to the inclined floor.
Here’s what I’ve tried so far:

JoinGeometryUtils.JoinGeometry(doc, wall, lowerSlab); → Has no visible effect.

WallUtils.AttachWallBaseToElement(...) → Not available in the Revit 2024 API.

Is there any way, via the API, to make the walls follow or attach to the sloped surface of the floor?

Thanks in advance for any help!

 

[edward_pham47W2R]

Typically I'd go into the elevation/section view of the wall then edit its profile.

Modify>Edit Profile.