I paid $X amount due in 2021 original return. In amending 2021return $Y is due. In amendment tax paid section, how do I mention earlier paid $X since it is not shown

Looks in amending tax return earlier paid amount due of federal tax is not considered out of the box and we need to show it ourselves but it is not clear in which section of tax paid we need to specify original return due federal tax that had been paid so that amendment due tax is not inflated