Hi, @sanetdikkumbura1950,
If your building pad is at a fixed elevation, and the distance from the kerb edge varies, then you'll have a varying gradient between the kerb edge and building. Where as the daylight Sub Assembly you're showing has a fixed gradient and probably wants to target a surface. I would use a different sub assembly here, using something that will target via a width target using a polyline/feature line at the building pad edge.
It can be tricky when tieing in a road edge to a building when the footprint isn't straight forward. I usually create a separate surface for this area using an auto feature line from the corridor kerb edge, added to a surface with the building footprint feature line, then cutting out/hiding the building pad. You can create a composite surface if you need it as one at the end.
Ian Chapman
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