CiviCRM Community Forums (archive)

I have a civicrm event which has a price set of the following:
 Part 1 = 10,000
 Part 2 = 10,000
 Part 3 = 15,000
Package Rate = 30,000

I want to use checkbox so that if user checks part 1 and part 2 ,the total amount of event fee would be the sum of the 2 parts(part 1 and 2).
My problem is if user checks part 1  and or part 2  and decided to get Package Rate which covers  parts 1,2,3 for the discounted amount of 30,000 instead of 35,000 the other check box will not  uncheck automatically.
What i wanted to do is to uncheck all other checkbox when user selects Package Rate checkbox.

I can use radio button but if i use that i need to add more fields like this
 Part 1 = 10,000
 Part 2 = 10,000
 Part 3 = 15,000
 Part 1 and 2 = 20,000
 Part 2 and 3 = 25,000
 Part 1 and 3 = 20,000
Package Rate = 30,000

Any ideas ho to make it work with checkbox?