Dimensions and liabilites

I am trying to understand the use of dimensions and am liking the way it works for our non-profit. I just have this question about how this would work out:

I manage a non-profit music group and wondered how I would work this out (or if what I am doing is right). From time to time, during a particular concert run, and to accommodate the flow of money I do the following (I am using "Bach Bites" as a concert example):

* I personally cover the expenses of the concert "Bach Bites" till the tickets sales income is deposited into our bank account (I have set up a dimension in FA called "Bach Bites"
* I have set up "items" with "Bach Bites" chosen as dimension

Now here is where I get a little confused, I would like to track my costs of the "Bach Bites" concerts using the dimensions, but how do I make sure that my payments to the items where I have covered the costs are also properly noted in FA?

Marc