How to back annotate ports in Orcad schematic

Hi Gurus,

Using backannotation option we can backannotate reference designators from pcb (if we assign the new refdesg in pcb) to schematic using .SWP file my question is that is there any way by which we can backannotate the ports in schematic for example we have 400 pull down resistors at a bga we load the netlist now one way is to swap the resistors and place that which is so tedious job or the other way is to place all 400 in a sequence without swapping and route at the best fit then backannotate the ports(swap the ports) or backannotate the refdesg using backannotation option?

Please guide 

Regards 

NWK