To Create an Empty Subassembly
You can create a subassembly with no initial geometry.
1. In an open assembly, click . The Create Component dialog box opens.
2. Click Subassembly, and then Standard.
3. Accept the default file name or enter a new file name, and click OK. The Creation Options dialog box opens.
4. Click Empty.
5. You can select Leave component unplaced to include the new subassembly in the assembly without defining placement constraints.
6. Click OK.
The new subassembly is placed in the assembly, or it is included in the assembly as an unplaced component if you selected Leave component unplaced.