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Subtracting c2 from b2. =imsub(c2-b2). Im wondering if thats why the sum function isnt working
Yes, it is.
First, presumably your formula is =IMSUB(C2, B2). What you posted (minus sign instead of comma) is a syntax error.
Second, IMSUB returns text. And the SUM function ignores cell values that are text.
The formula in D2 should be =C2-B2 . Similarly in D3:D32, perhaps.
But SUM might still return zero, or at least display a value that appears to be zero.
You have not provided sufficient information for us to know what result to expect from SUM. What are the individual values in D2:D32? What is the format of D33, which contains the SUM formula?
If SUM(D2:D32) still displays zero or any other unexpected result after correcting the formuls in D2:D32, upload an example Excel file (redacted) that demonstrates the problem to a file-sharing website, and post the download URL in a response here.
I like box.net/files. Others like dropbox.com. You might prefer onedrive.live.com because it uses the same login that you use for answers.microsoft.com. In any case, test the download URL first, being careful to log out of the file-sharing website in order to ensure that anyone can access the download link.