Creo Expert Moldbase Extension > Setting Up the Project Assembly Structure > To Delete a Subassembly
  
To Delete a Subassembly
Before you can delete a subassembly, you must delete its assembled components.
1. Click EMX Assembly > Structure > Remove Subassemblies dialog box. The Delete Subassembly dialog box opens.
2. Select the subassembly to delete from the list on the left. The subassembly components appear in the list on the right.
3. Click to delete the subassembly.