Assign Value to Control from Calculated Field in another Form

The problem -All suppliers but one supply in Litres (the other Kg). Currently if the supplier is selected in ControlB a pop up form with unbound box for Kg and another with the conversion formula. So I close the form and type the calculated value to ControlC ( assuming I can remember the number and my yptos oops typos don't get in the way
how good would it be to update controlC with a Close Button on frmConvert

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