Thanks for the explanation. One way could be select all the surface exculding one face and copy paste. Later on copy paste the excluded face, this way you will have 2 surfaces instead of many after detach all operations. Now provide the thickness value to the surfaces.
You can set selection filter to faces, box-select all the faces, press ctrl and deselect one face.
 Are you going to perform simulation in Discovery or flagship tools? What type of simulation are you going to perform?Â
You are navigating away from the AIS Discovery experience