Click Model tab > Levels and Sets panel > Create Set to create a new Set 
in the Explorer.
The new Set contains no entities. You can move an entity onto the Set using the Model tab > Levels and Sets panel > Acquire > Acquire option.
Click Model tab > Levels and Sets panel > Create Set to create a new Set in the Explorer.
The new Set contains no entities. You can move an entity onto the Set using the Model tab > Levels and Sets panel > Acquire > Acquire option.