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Here are some additional points for further consideration. For the case of flat slab (like the one shown in the picture by Shaker) even if the "drop zone" creates a beam, the beam wouldn't provide the necessary action because of lack of any support at its end. I will try to sketch up something and post it to explain my point. In addition to that, the drop portion cannot be casted as one piece. The bottom slab has to set and harden and then the top portion can be poured. Thanks.

Sir, Section Designer can be used to assign custom wall sections including boundary elements with reinforcement configuration and analyze them. For the attachment, please see discussion under the heading "2D and 3D Shear Wall Configurations". Here is an excerpt from the document: etabs-multistory-concrete.pdf Thanks.

I would also design it as a continuous member. The ability of this member to tranfer moments across drop will depend upon detailing, and the sample detailing in the picture does not seem adequate; there should be a double bend (u-shaped hook ) instead of the standarad L shaped.

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Wa-alaikum-assalam, Dear Mubeen, Selection of the structural system for a building would generally depend upon the seismic zone or category of the area where building is to be constructed and the preferred material of construction. For a B+G+5 building with Reinforced Concrete as preferred material of construction, my obvious choice would be a Concrete 'moment resisting system (MRF). Which MRF (IMRF, SMRF etc) would actually be used, will depend upon the selected 'Lateral Force Resisting (LFR) System' corresponding to the seismic design category (or seismic zone) of the area, and the code (UBC-97 in the present case) requirements / restrictions applicable for that area. Value of overstrength factor 'R', would correspond to the 'LFR System', adopted for the building. Types of various Building Systems, LFR Systems, their corresponding R values and restrictions on the use of these building / LFR systems are available in Table 16-N of UBC-97. BTW... Where is you building located? And, what is your preferred material of construction. Regards.