My gut tells me they would be ignored, but to be honest, I have never taken that approach to importing price lists.

I have always exported the current items, updated the prices in Excel, then imported the list back in again.  That way I always have the proper file format.  Remember that prices can only have a maximum of 4 decimals, not 8 decimals displayed as four decimals in Excel.

To properly test your scenario, I would recommend doing the import on a copy of the company file first before you commit to the live file because then you can work out any problems before updating your live file.  Always have a current backup before you do any mass updates like an import.  They can go wrong very fast.

My gut tells me they would be ignored, but to be honest, I have never taken that approach to importing price lists.

I have always exported the current items, updated the prices in Excel, then imported the list back in again.  That way I always have the proper file format.  Remember that prices can only have a maximum of 4 decimals, not 8 decimals displayed as four decimals in Excel.

To properly test your scenario, I would recommend doing the import on a copy of the company file first before you commit to the live file because then you can work out any problems before updating your live file.  Always have a current backup before you do any mass updates like an import.  They can go wrong very fast.