Hi mantaskava, I've attached an attempt at building in a fill piece and then cutting away some space with Trim and putting in a Blend surface.

But I think it may be difficult to get a good looking transition since these areas are quite flat:



It would be good for those flat shapes to have extended further down if possible.

Or another possibility to get better shaping could be to cut away a larger space so the blend could have a larger transition from the flat areas.

- Michael