Save parts as a new subassembly
First, model parts to the main level off the assembly. Then, select parts and create a new subassembly from them.
- Select one or more parts from the assembly tree or model.
 - Select the context-sensitive function 
 Save as Assembly.... - Define the data of the new document:
- Name the part in the Label field.
 - Select 
 To Project when creating a document for a specific project. Activate an existing project by clicking the Select button, or create a new project by clicking the New button. - Select 
 Local, which saves the assembly as a local assembly. 
 - Click OK.
 
Note: 
  - In Flow, the selected parts are automatically saved as new assembly items in the product structures.
 
