Auto-update Payment amount to match Order Total

When we take manual orders on the phone the amount to be charged is never auto-updated to the new Order Total and it must entered manually, it's very inconvenient and sometimes it can cause errors if the order was modified.

The Payment amount before charging/authorizing the card should match the Order Total when the "Calculate Shipping" or "Update Totals" is clicked.

As logic process of taking an order, the total to be charged should match the total instead of having us to manually enter this information. I don't understand the logic to make this a manual process, takes time and can cause human error.