SugarLogic Calculated Field script to calculate the subtotal, with respect to quantity and provided discount (dollar amount or percentage), for product line items on SugarCRM Quotes.

sugarcrm-quote-line-item-subtotal-sugarlogic

ifElse(
    $discount_select,
    multiply(
        subtract(
            $discount_price,
            multiply(
                $discount_price,
                divide(
                    $discount_amount,
                    100
                )
            )
        ),
        $quantity
    ),
    multiply(
        subtract(
            $discount_price,
            $discount_amount
        ),
        $quantity
    )
)