Belmont day Grand slam wager ???

there is the grand slam wager races 7,8,9,10 on 6-10-6.

that way you can play the 8,9,and 10 races and skip the belmont,
the seven race is the 6 horse fillies on turf.
this might be the ticket.

please help me here with understanding this bet.

the horses in the first three legs just have to win place or show, and the final leg they have to win, is that correct, or is it the first three legs win and place without the show ?