Budget Amount Analytics

Hello to the Brain Trust,

I am trying to create a dashboard with budget amount for a 3-show run.  When using a pivot table, if I add it to "Rows" I get what I need, but I really need it to live in the "Values" field so that I can run a formula like [Total Ticket Paid Amount]-[Total Budget Amount]. 

The problem is it does not return the right amounts.  When I looked at documentation there is a caution that " This field should not be used as a Value field without applying multi-pass aggregation", my problem, I have NO IDEA what that means or even how to do it.

Has someone done this successfully and can I steal your formula?

Thanks in advance for your help :-)

Kimberly