what i have tried

1. insetting but insetting starts tearing the faces after some thickness
2. i tried beveling but i do not have idea how do i do varying bevel as shown in the picture

what i have tried

1. insetting but insetting starts tearing the faces after some thickness
2. i tried beveling but i do not have idea how do i do varying bevel as shown in the picture

edit:

1. the face tearing is marked in red
2. I want to inset the face and modify it along the blue lines (how do I do this?)
3. the bevel thickeness of inset is 3cm in thickness