Details will help.. Guessing is not a productive way to handle troubleshooting..
when you say "the subtotal will go wrong" some specifics of what you did, how your store is configure, etc would help..
does the product you added to the order have attributes?? are your products priced by attributes?? Are you using any order total modules?? if you are which ones?? what did the totals look like after editing?? what did you expect them to look like??
DETAILS my friend will help..
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