I'll start with a basic blender edit technique on New Genitalia by 3feetwolf.
This same technique should also apply to the base G3/G8F gens and Golden Palace.
1. Load your G8/8.1 Female and add New Gens to it.
2. Tweak with morphs the gen however you want. Keep in mind whatever you do here will be fused into a single morph by the end. Or set all params to 0.
(img1)
3. Hide everything on G8 model except for the attached in Scene tab.
4. Select the New Genitalia for Victoria 8 in the Scene tab.
5. Set Resolution in parameters to Base! From my understanding only PA's have access to HD imports.
6. Export as Obj and your options should be similar to that as shown in image 2.
(img2)
7. Open up Blender, delete everything in teh initial scene and Import Obj
8. Check that Keep Vert Order and Poly Groups is selected.
(img3)
9. Click on the vag object in scene and switch to sculpt or edit mode (I'll show sculpt mode here.)
10. Use the tools to modify the mesh, be careful not to change the outer edge geometry in any way.
(img4)
11. Export your modified mesh from Blender as an Obj.
12. Make sure to check Selected Only and Keep Vert Order.
(img5)
13. Switch back to Daz and click on Edit, Object, Morph Loader Pro.
14. Click choose morph file and select your Blender exported obj and accept.
(img6)
15. If you did it all correctly it will say Created morph successfully.
16. In parameters restore resolution to High Resolution and find your new morph named whatever the Blender exported Obj was called.
17. Slide it up.
18. You may need to ZERO out all the other parameters to get it look as you edit it in Blender.
(img7)
19. Unhide the character and layers in scene view.
(img8)
(img9)
MidnightWatcher attached the following image(s):