DP / Flex Help!

[NPRIVITOR]

Hi Blues, a friendly coach here and I've been told this is the best source for my rule questions regarding NFHS.

I "think" that I have a fair understanding of the DP / Flex rule. However, like most coaches, there are some things I need some guidance with.

From my understanding, the DP can enter on Defense for any person at any time. If the DP enters on defense for the Flex, then the Flex has left the game. I have 2 questions regarding this scenario.

1. Can the Flex (or substitue) re enter as the Flex and i'm back to 10 players again? I can go from 9 to 10 players a number times during the game by using subs in the Flex position - is this correct?

2. A bit more complicated question (for me anyway). Of the players, I have Player1 as my DP batting in the 1 hole, Player2 as my Flex, Player3 batting in the 4 hole playing F8. Since the DP can enter the game for anyone at anytime, can I enter the DP during the top of the 1st inning and place Player3 on the bench. Now I would have my DP and Flex on defense. Is the DP designation still assigned to Player1 or did it follow Player3 to the bench.

Thanks!