For change unit sold, go to Object Editor -> Units tab -> (Select the building you want the building to sell units) -> Techtree - Units Sold (here is the edit of Sold Heroes)
WHAT do you mean by port ?
After the heroes are bought, the unit INSTANTLY (kinda like blink) moves to a <position> ? (Straight appear to Point B)
After the heroes are bought, the unit is asked to Move To to the <position> ? (Appear at Point A (nearby the sell heroes building), then walk towards Point B)
Which one you want ?