Vista - Managing 2 activesync relationships

I have a Atom O2 PDA which I have set up a relationship on a PC at a previous
job.

I now need to set up a relationship on my new PC, however I cannot change
the setting of the calendar sync without deleting the calendar that already
exists on my PDA.... I need to keep all of the calendar entries already on my
PDA and would like if possible to upload the data from my PDA to my new PC.

Is is possible to set up this without deleting the relationship with PC 1
and all of the information it had sync-ed to my PDA??

Thanks
lorissa