Just take away the steel beams you mention and use a Displacement boundary condition (not a remote displ.) on the slab (UX,UY,UZ). That is fine and that is typically OK, as seen in an example of punching shear (slide 9 in the link below, where the steel beams are just modeled as a displacement BC there) - use also this workflow below to model RC structure.
Closing this post as it has been answered - if you have any other question open up a new one.
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