I understand that. Did you try what I suggested?
Or are you saying that you ONLY need to sum them at their own group level? If so, you don't need a variable, just a formula like this:
sum ({@Quoted 1}, {Command.CUSTNAME})) +
Sum ({@Quoted 2}, {Command.CUSTNAME}) +
Sum ({@Quoted 3}, {Command.CUSTNAME}) +
Sum ({@Quoted 4}, {Command.CUSTNAME}) +
Maximum ({@Billed 1}, {Command.CUSTNAME}) +
Maximum ({@Billed 2}, {Command.CUSTNAME}) +
Maximum ({@Billed 3}, {Command.CUSTNAME}) +
Maximum ({@Billed 4}, {Command.CUSTNAME})
-LB