Can I save a sum of column into a customfield (Idalko Table grid editor)

Sergio _

I have configured this comun

col.total=Total
col.total.minValue=1
col.total.width=100
col.total.type=number
col.total.formatNumber= #.##
col.total.formula= {precio} * {unidades}
col.total.summary = sum


I need to save the sum in a customfield. That is possible?