It's great to have you here in the Community, SponneandBickerstaffe. I can see the importance of being able to personalize your invoices according to your preferences.
With QuickBooks Online, you have the flexibility to tailor your invoice template to reflect your unique style and even add custom fields. However, it's worth noting that the system doesn't currently support a field that automatically displays the calculated amount or consumption from current and previous bills.
Based on the invoice you've attached, it looks like you're handling this matter correctly. You manually added the updated value in the quantity field, and the system automatically calculated the quantity and the rate, which is a great workaround.
In addition to this, I'd like to recommend a couple of super helpful articles in QuickBooks that can make managing your invoices and transactions a breeze:
Please feel free to reach out if you need further assistance with customizing your invoice template or if you have any other concerns. I'm here to support you and will be closely monitoring this conversation to provide prompt help.
