Courtesy Runners
 

A courtesy runner for runs the bases for either F1 or F2 in the early part of a NFHS game.
Can the courtesy runner later legally enter the game as a subsitute for a different spot in the batting order, other than the F1 or F2 that they originally courtesy ran for? Or are they locked into that one spot in the batting order, once they courtesy run?

Yes. No.

To clarify SRW's somewhat verbose response... ;)

A courtesy runner is just that - a courtesy. She has not legally entered the game as a sub. She retains all of her rights as an unused sub, except one: She may not enter as a sub in the same half inning that she ran as a courtesy runner (exception for injury and no other eligible subs).

Thanks much. So if a player courtesy runs for F2 in the 8-spot in the bottom of the 5th inning, she can still play F9 in the 2-spot in the top of the 6th inning?
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But if she is in the lineup early in the game and is substituted for, then she is no longer eligible to be a CR for the F1 or F2, at different batting order spots (other than the player's orginal spot) later in the game, right?

Yes
I'm not 100% sure what you are asking here. A courtesy runner must be an unused eligible sub. No player who has been in the game can be a courtesy runner. A starter who has been sub'ed out can re-enter, so long as she bats in the same spot in the batting order.

I think, after reading and reading Bluefoot's second part of his post, in his own convoluted way he is saying essentially the same thing.