Dual Waterfall

I'm running into an instance where I know what I want my graph to look like, but have no way to get it there.

What I have is two separate sheets, one for billing and one for expenses. The billing sheet has the date and the billed money totals, the expenses has the dates and cost for things ordered. I'd like to track each one on the same graph, with the X axis being the date. Each different line, the billing and expenses, should add up as the dates progress. It seems a waterfall graph would work, but I initially thought of a game flow graph on how it should look in the end.

Either way I can't get any graph option to look like either of those options.

Game flow.JPG