Can you add a Variance between Actual YTD $ and Full Year Budget $ in the P&L Forecast report?

A client recently asked if we could add an additional column to the GL Profit & Loss Forecast II report (used in the Favourite P&L - Actual v Budget inc Last Year - Ultimate Month End)

They want a new Variance column added that calculates the difference between the Full Year Budget and the YTD Actuals.

This variance will essentially show how much of the Current Year total Budget has not been spent yet and is still available.