Make a Credit category that corresponds to case expenses.

For instance, when a case has multiple settlements in it, we need to be able to reflect that we have reimbursed some of the case costs. It does not make sense so have to go costs entry by cost entry and mark them paid until you get to the exact penny of how much came from the first settlement versus what is left owing. If there was a credit that could be applied to the total of the oustanding case costs, that would be great.