We're in the process of changing from Smarteam to SW PDM.  I have thousands of SW Drawings with Balloons attached to their part but have used "Text" instead of "Item Number" in the Balloon Text field.

I've been shown a way to get Balloon/Item Numbers from my newly created Drawings by adding a BOM Table to my Drawings but need to find a way to get this for all the older migrated Drawings.

Is there a way to use change the Balloon Text to Item Number and then use that to populate the BOM Table I'll put on my Drawings?