Help with adding to a formula
 

Hi,
I'm using the following formula to add the totals in cell O10:O32 if the
data (which is a 4 digit code) entered in cell P12 matches any of the the
codes entered in cells A10:A32. If no match..then the answer is blank...or
if no total is in O12 then the answer is blank.
=IF(O12="","",(SUMIF($A$10:$A$32,P12,$O$10:$O$32)) )
For Example:
Col A Col O Col P
Col Q
(Codes) (totals) (Summary of Codes from A)
(This col with the formula in it..and answers a)

1234 1000.00 1234
1000.00
1235 2000.00 1235
5000.00
1235 3000.00 3200
500.00
3200 500.00

This is working great!

Here's where I need help:

I've added a new column that I need to factor into the formula and I'm not
sure how to do it..
The column is B ....which could have an X entered by the codes in A or not.
If there is an X entered in column B -- then.... I need the formula to look
at P12 to see what the code is...and see if there are any matching ones in
Cells A10:A32.. if it finds matching codes..then it needs to look at cells
B10:B32 and if any of the matching codes have an X next to them...then the
formula will not include that code's total in it's calculation...... see
below:

Col A Col B Col O Col P
Col Q
(Codes) (exclude) (totals) (Summary of Codes from A)
(This col has the formula in it..and answers a)

1234 1000.00 1234
1000.00
1235 x 2000.00 1235
3000.00
1235 3000.00 3200
500.00
3200 500.00

There are two entries for code 1235 in col A..but one has an X in col B next
to it..so the total in Col Q for the code listed in Col P...doesn't included
that total of 2000.00 for code 1235.

Any help to accomplish this would be greatly apprecaited!
Thanks in advance
Kimberly