Hi Andre,
Currently if you have 'header' fields such as customer code and 'detail' fields such as item number, you don't get sub-totals by item number. If Customer number and other 'header' fields are removed, the item sub-totals appear. Also, sub-totals appear only if there are 2 or more details to total - there isn't much point to sub-total a single item.
The Order Action report is not the same as the Sales Analysis Online Inquiry function (with customizable sort-by fields).
This may not be the best way to do things, but just reporting here how it is working.
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Regards,
Softrak Tech Support