I import a character G8)  from Daz fine to CC3 with transformer - but if I change the pose in CC3 (to experiment with iRay render) the toes pop through the shoe surface. Is there some trick to fix this?

That's a pretty extreme pose (with extreme shoes) and it's possible what you want to do isn't possible (even in Real Life - looking at the back leg I really don't think that a girl could keep her shoe on with that extreme a pose).  But if you let me know which shoes, exactly, you are using I'll take a closer look at it.

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley

Actually I am able to fix the rotation in edit pose  as well as corect the 'extremeness' of the pose itself - it's actually a standard cc3 pose. Thanks for the comment and offer to help. The shoes are peep toe platforms by Idler 168 at Renderosity.