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E.g. Use "T" or "F" to determine which line item to be found from another file (items to be updated). Delete all line with "F", then vlookup the price / cost / discount from another file.
4) Delete If users used adding new line approach, delete the exsisting line, just leave the new line in the template.
**If do NOT do that, the system will get stuck since so many lines to be imported while a lot are without changes.
Import back to the system and apply.
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