Variance vs. Budget and Filters

I have a table of projects, expenses and budgets.  I wanted to calculated variance from budget then do some filtering on those that are say 10,000 under budget. I have run into a few problems

I used a new column of Variance = table1[actuals ytd] - table1[budget ytd]

However if there are multiple lines for a project I get the variance per line when I need it aggregated at the project level.

I get:

Proj1  Amount1  variance 1

Proj1 Amount2  variance 2

Proj1 Amount3  variance 3  

Proj2 Amount4 variance 4

Proj2 Amount5  variance 5

Proj2 Amount6  variance 6

Proj2 Amount7  variance 7

 I really just need Project 1 and Project 2 the variances aggregated.

Seems like it should be simple, but looks to be hard.

then after i would want to be able to filter on variance totals.

Any thoughts?

 Alan