Create a subquery in your data source that calculates the total for all items, then insert an unbound textbox into your report. There you can use the builder to create your calculation field.
As far as your footer question, use a bound textbox with the value in the calculation i just mentioned.
If you were only needing the grand total, it would be easier to just insert an unbound textbox in the footer of the report. This text box would be a copy of the item you would like to sumarize. After you paste it you just add =Sum(FIELDname) (or =Count()).
Sal
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