Namaste Sir, When we have retaining wall with varying depth, how can we detail the section where the depth changes? I have also attached one image, Can we detail like this or not?

How to detail the reinforcement in the Mat footing with Drop slab. Punching shear at corner and edge column is maximum, so I provide a drop to increase the depth my question is that how to detail in the drop ?? I have also attached some picture please suggest

when we model basement wall, How load transfer happens?? I am designing mat foundation, if we import the Etab model with basement wall in safe, then the safe makes the wall as a deep beam, so that there is no punching check , how to ensure the footing is safe in the punching in that case. Here, I have attached the simple study model, in this model in the first case I haven't divided the wall and see the joint reaction. In second model I have divided the wall, and see the joint reaction. I am confused, what is the best option for taking the load, while designing the mat foundation, either to divide ( how many??) or not to divide. if we dont divide then the punching shear ratios will be high under Column 2. Next question. we provide the stiff slab propery same as column dimension while modelling in the SAFE. Should we have to draw the stiff slab property in the place where basement wall is present? Hope you get my question ... Looking forward to hear your answer.. Thank you so much sir

I think, we should not have to consider because, the column face are parallel to x and y direction. Sir,Please clear this doubt in your style Thank you for your valuable answer