You're correct. Either fill out the numbers 5-3-4 on the betting slip, or tell the cashier that you want a pick 3 ticket for 5-3-4.
They'll know.
Pete
BTW: IL, GA & LA were losers last night. (They are the other games I'm tracking right now.) On the other hand, I won another $50 on last nite's TN Cash 3 game.