My table looks like this:

https://dl.dropbox.com/s/dckw0rdxh3mpqml/zohosum1.png

And my record summary looks like this:

https://dl.dropbox.com/s/1dxvhy24jsxhmtn/zohosum2.png

How to sum numeric items from ${Invoided_USD} column, similar to Subtotal in this example?

https://www.zoho.com/creator/help/images/record-summary-invoice-details.jpg

Also is that https://www.zoho.com/creator/help/images/record-summary-invoice-details.jpg record summary available somewhere as template?