LG VX-8100

I posted a thread earlier but thought I'd post a new one and be more specific about my question. I have an LG 8100 and a 4650 want to be able to send the phone contacts to bitpim. Bitpim sees the 2 different phones, it even asks me to name them and it will recognize as soon as I plug the phone into the data cable. But the key is I want to keep the contacts separated between the 2 phones. Right now I have the 8100 backed up on bitpim but am paying the 1.99/month for backup assistant on the 4650. I want to use bitpim for both, and I don't want to merge the contatcts together. Is there a way??

Thanks!