Hi there, i'm trying to perform a simulation of a prosthetic socket with the soft tissues inside. i need to fill up my prosthetic socket with the soft tissue part in abaqus. what i tried to do was sketch and extrude a simple box that would fill around the socket then cut away the box with the cut and merge operations in the assembly module, the end result being the socket with residual soft tissues inside. but i'm not getting the result i want, what do i do? i'm quite new to Abaqus so i feel like there's something obvious i'm missing