It appears if you save a drawer box in the drawer box designer that you have made changes too using the part editor then use the saved box in a cabinet the P/Ed changes do not carry over to the newly dimensioned box, in other words if I create a drawer box with the cut-outs in the back for the under mounts save it then open a different cabinet apply that particular box to it the cut outs are no longer in the right position, same for the drawer front mounting holes.
Do we need to take each individual drawer box to the Part Ed. After it has been created and placed in the cabinet make the cuts and then save the cabinet.
When designing the drawer in the drawer designer, after you place your cuts and holes, you need to constrain them, just as you would constrain PE cuts in a cabinet part.
Once you have all your cuts in the right places and constrain them, this will be your seed drawer. You will not need to edit each individual drawer in the cabinet.