RC cantilever slab

I would disagree with your "model for design": you'd need to include the slab on the other side of the cantilever (not to mention the walls).

As for how much moment the wall (and so on) sees....a analysis will tell you that. Undoubtedly, the wall will attract some due to it's flexural stiffness.....but the slab on the other side should help.

There was an extremely similar thread not too long ago that we got deep into detailing the reinforcing for a thicker slab that extended back into the building.

OP said:

Im wondering what heappens with bending moments at the end of a beam (at the wall) - does majority of bending moment go to the column since its more stiff and properly reinforced for a moment transfer?

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For design purposes, I'd put all of the bending moment into the column and then provide "detailing" reinforcement for the other, redundant load paths that are bound to pick up some load.

OP said:

How much of this bending moment does RC slab above a wall see in this case?

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Finding out accurately would require a more detailed analysis model as WArose has suggested. That said, if your proportions are drawn somewhat accurately, I wouldn't expect much moment in your slab.

I feel that there is no need for considering beam, column combination for this structure, though it is another way of supporting the structure.

The slab portion covering the balcony area can be treated as a simply supported span with an overhang. Since the walls are of masonry, there will be very little restraint to rotation at supports.

You have mentioned that the overhang (balcony) span is 2m. but the span behind the cantilever is not mentioned.

We can consider that the moment from the cantilever to be transferred to the span behind.

If the slab behind is large enough, there is less possibility to have an upward reaction (uplift) at the farther end of the supported span.

The detailing will be to anchor the top rods of the cantilever into the span behind.

In the second option with beams and columns, the balcony slab will be designed as a slab with three sides supported and the fourth side free but the beams will be cantilevers.