I'm pretty good now at creating custom morphs with Poser and zBrush, but how does anyone manage to create open-mouth morphs for V3 using (as recommended)the 'No World Transformations' exported V3 figure? The lips intersect eachother by default! zMorph doesn't seem capable of selecting contiguous polygons (which would solve the problem - you could select part of the visible lower lip and 'grow' the selection); Cinema4D can do this, but is useless at exporting Poser-friendly OBJ files. Can anyone else advise me how to create open-mouth morphs on the Victoria 3 base model when I can't even separate the lips?

If there's an existing open mouth morph which is close to what you want, set up a small amount and export that instead. DAZ would not want any amount of one of their morphs redistributed, though; so you'd have to 'subtract' the original morph first. V3's mouth is difficult to work on, for sure.