"Remaing Balance" through Custome Report along with "Custom Field"

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


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.