Tab command
Use the Tab command 
to construct a tab feature on a sheet metal part. You can use this command to construct a base feature or add a feature to an existing sheet metal part.
In the synchronous environment, you can construct a tab with a single sketch region,
or with multiple sketch regions.
Creating tabs in the ordered environment
In the ordered environment, you can construct a tab with a single profile,
or with multiple nested profiles.
When selecting multiple profiles, the profiles must be in the same plane. When constructing a base feature in the ordered environment, the profile must be closed, and you must define the material direction and thickness.
For subsequent features in the ordered environment, the profile can be open or closed. When using an open profile, you must define the side of the profile to which you want to add material.
Creating tabs in the synchronous environment
When constructing a base feature in the synchronous environment, the sketch region must be closed, and you must define the material direction and thickness.
For subsequent features in the synchronous environment, the sketch can be open or closed. If the sketch is open, the edge of the tab must close the sketch to form a sketch region. Subsequent features are automatically added when you select the extrude handle.
Editing tabs
After you create a tab, you cannot change the thickness or offset direction for the tab. You can use the Material Table to change things such as global thickness, bend relief, and relief depth.
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