Your initial data consists of three bodies designed as shown below. From the
The result is immediate. the app displays this new body referred to as
Body.3 in our example, in the tree. It is underlined, indicating that it
is the active body. The image associated with bodies in the tree differs from the image representing the
part body. A blue gear as well as a yellow
plus or minus sign have been added to the green gear. These signs indicate
the polarity of the body.
This new image lets you quickly tell a body from a part body especially if
that one has been renamed.
You can construct the geometry for this new body using the diverse commands
available in this app or in other apps.
You will notice that Part Body and
Body.3 are autonomous. The operations you would
accomplish on any of them would not affect the integrity of the other one.
Now, if you want to combine them, see the tasks showing the different ways
of attaching bodies in the Part Design User's Guide: Associating
Bodies: Trimming Bodies.