If i want to delete the quota specs for any group what should i do?.Should i just convert its hard and soft limits to "0" or is there any other way?.

If i have user1 which is member of group A as well as of group B and due to some
reason i delete the group B.Now what will be the quota specs for that particular user?.Its quota for group B will be finished automatically or do i have to change them myself?.What will be the solution in this case?.