Extract data from chart to make new chart?

Question

Hello all
This is my first time using Numbers (or really any spreadsheet for that matter), and I have run into a question:
I am using the default template to set up a Personal Budget. In my Monthly Expenses column I have the following:
Rent, Food, Utilities, Car Payment, Gas, Car Insurance, Clothing and Misc.
I plug in the values and get my total monthly expenses (it's so easy!), and then I can select the values and get a nice pie chart of the percentage of each expense out of the monthly total.
What I would like to do next, is take all car-related expenses (Payment, Gas and Insurance) and extract that into a new chart, and show those expenses as a percentage of the TOTAL monthly expenses. I'd like to see what percentage of my bills is the fault of my car. Is this possible? And if so, does anyone know how?
TIA
Richard

Answer 1

Here are the required basis:
In Resume 1,
in B1 (header row) I entered:
=SUMIF(Main :: A,A,Main :: B)
in B10 I entered =SUM(B)
Yvan KOENIG (from FRANCE jeudi 16 octobre 2008 14:37:04)
in C1 (header row) I entered:
=ROUND(B/B$10,2)
I charted the range B2:B9
In Resume 2
in B1 (header row) I entered:
=SUMIF(Main :: A,A,Main :: B)
in B2 I entered:
=SUMIF(Main :: A,Resume 1 :: A2,Main :: B)+SUMIF(Main :: A,Resume 1 :: A3,Main :: B)
in B9 I entered =SUM(B)
in C1 (header row) I entered:
=ROUND(B/B$9,2)
I charted the range B2:B8