The Bank can decide how to split the costs of something if it thinks the costs are related to two things: the Bank doing its job under this part of the law, and the Bank doing another job. You need to know the Bank does different jobs, and sometimes the costs are shared between them. The Bank gets to choose how to split these costs to figure out how much should come from a certain fund, which is talked about in section 199(a).

The Bank decides how much of the cost is for the fund under section 199(a), and that amount is treated as a cost for that fund. This means the Bank has to keep track of the costs and make sure they are counted correctly for the fund. The costs are split so the Bank can work out what to pay from the fund.