You must use bodies as entities you will eventually associate to the Part Body. To do so, you can use the capabilities described below and then finish the design of your part.
Inserting a New Body Inserting a Body into an Ordered Geometrical Set Managing Geometrical Sets Managing Ordered Geometrical Sets Inserting Features into a New Body About Boolean Operations Assembling Bodies Adding Bodies Intersecting Bodies Removing Bodies Trimming Bodies Keeping and Removing Faces Changing a Boolean Operation into Another One Location of Operating Bodies in Boolean Operations