We do not currently have this feature available, but you could get the same result by doing the following. Create a user defined field in the Quote_Custom table to contain the quote subtotal value. Create a SQL trigger to update the custom field any time the quote subtotal field is updated in the quotes table. Show the quote_custom subtotal field anywhere you want with screen design. This will quickly get you the results you are looking for. If you need assistance with the trigger, contact your reseller for assistance.