How can I remove Hebcal from calendar if it was downloaded directly instead of subscribed?

I downloaded Hebcal to my google calendar instead of subscribing. It is now integrated into my main calendar and I can't get rid of it. I would like the dates, but I want to be able to turn them on and off ... right now all I can see is the Hebcal dates and I can't see any of my own appointments. It is a real problem.