@rubenmarin thank you! I tried the expression provided but the overall output is still 0. However if I make a vendor selection, it is correctly displaying the savings percentage for the selected vendor.
Are there any other minor adjustments to this expression that I can make to have the KPI reflect the overall savings percentage? FYI...I had to remove the contents of the post even though the information posted was anonymous. If you need more context, I will be happy to send a private message.