John-
If you click on report, edit selection formula and enter the formula, left({Customer},1)<>"D" and your report will not contain any customers that begin with the letter "D", nor will their values evaluate in any sub or grand totaling.
This is the way to exclude records (and their values) from a report, NOT conditional supression. Group selection formulas work similar to this.
If you do have a valid reason to include customers begining with "D" in your report, but you don't want the values to evaluate in sub and grand totals, create a formula like:
If Left({Customer}),1) = "D" then 0 else {Valuefield)
Then summarize the formula field as needed.
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