Hi Gail:

Is your intention to replace item ABC with item code XYZ (ie. ABC ceases to exist)? Or are you leaving ABC there and adding a new item coded XYZ?

If the former, export/import won't work. You need a code changer module that will search for all occurences of ABC and change them to XYZ.

If the latter, could you tell us in what way it didn't work the last time?