ℹ️ This tool is available to all users.
You can create hollow bodies with the Shell tool. Basically, you remove a face of a body and standardize the wall thickness.
The following steps show you how to do that:
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Go to Tools > Shell.
- Select one or more faces of one or more bodies to remove.
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Drag the arrows to set the wall thickness of the shell.
Select the dimension label and specify the thickness if necessary. You can also type in the exact value and press the Return key to finalize the dimension.
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Select Done.
💡Shortcut💡: If you select the face you want to remove or the entire body, the menu is customized automatically. From this adaptive menu, you can select the Shell tool to hollow out the body. 
When you’re done, select an empty area in your design space to close the tool.