Opening in Shell & Shell+Beam

A newbie here and trying to explore the oppurtinities that Karamba can bring to our daily tasks.
Two questions here.
Is that a possibility to have an opening in a shell structure?
Also, is there any possibility to place the beams and sheels on top of each other? As in the case of precast beams + slabs.

yes, openings are possible, you just need to input a mesh that have the openings modelled.
Beams integrated into shells (ribs) can be defined by making sure your beam end points are integrated into your mesh input.

You can refer to Karamba3D TidBits #32 Reconstructing Nervi on Vimeo or Karamba3D TidBits #26 Ribs from Principal Moments on Vimeo