I Generate the Custom Field in Sales Invoice

Found result as per requirement
Sales Invoice Report by Custom Field
Custom Report for Specific Custom Field
Result

Now the Question is What should i add to have Remaining Balance in Invoice
I Generate the Custom Field in Sales Invoice

Found result as per requirement
Sales Invoice Report by Custom Field
Custom Report for Specific Custom Field
Result

Now the Question is What should i add to have Remaining Balance in Invoice
@lubos Please any solution…?
A custom solution will only be available once the Extentions part has been finalized. But for now, that shouldn’t be achievable.