I was looking for a way to do it as well, and as far as i can tell you can't. i was thinking about taking it into my store and importing it using the machine that vzw stores should have to transfer contacts.
Official method seems to be you have to do it 1 at a time. Open the contact in the phone book and use the BB Option key to "Send to SIM". Restoreing it happens all at once...but copying to the SIM is manually one at a time.