Multi-body publish
In multi-body modeling, you may want to have each design body reside in an individual file. There are a number of reasons for this.
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Account for the design body as a unique part number in an assembly bill of materials
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Flatten a sheet metal model
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Reuse the individual model in another context
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Build an assembly from the multi-body part models
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Apply assembly features on all bodies
 
Use the Multi-body Publish command 
 to write each design body of a multi-body file into a separate file. The command               also provides the option to create an assembly using the multi-body published parts.
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