Click the Shell tool in the Create
ribbon group on the Design
tab.Mouse over the solids in your design to highlight the faces that could be
removed.
(Optional) Enter a value into the dimension field to change the thickness of
the shell.Enter a negative number to create the shell thickness from
the outside of the solid.
Select the face you want to remove.The face is removed and a shell is created. The baseline of the offset is shown in blue. If you did not change the
thickness, the default thickness is set by the minor grid
spacing.
(Optional) Continue clicking to remove additional faces.
Shell tool in the Create
ribbon group on the Design
tab.