I have a upper level assembly which is made up of sub assembly components. The problem is that when the assembly was first made some items were inserted by themselves; i.e as individual parts, not as a sub assembly. Now the drawing BOM shows these parts as being individual parts of the upper level assembly, where they should be part of a sub assembly. Is there any easy way to place the correct sub assembly into the model and have these individual parts sub assembly components? All i want is the BOM to show the detailed numbering the individual parts to be sub assembly components, not individual parts.