Google Calendar Synching Priority

I need help with a calendar synching issue. When I got my system update for 2.1, I recall during set-up being asked to set the priority for the calendar synching. Admittedly, not thinking it through, I believe I set it for the calendar on my phone to take priority instead of having the 2 calendar versions merge. Consequently, I wiped out my internet-based calendar. I was able to restore the calendar onto my phone with all of what I had in the internet-based calendar.

My question is...how do I change the synching priority? I've looked everywhere I can think, but can't find a way. I need to make the two calendars merge their data.

Please help, and thanks in advance!