Select the runtime folder that's inside your other runtime folder and cut (Ctrl+X). Now go up one level so that you can now see the outside of the other runtime folder. Drop the cut runtime on top of the outer runtime (Ctrl+V). Everything will settle where it needs to go. Now you'll have just one runtime but Poser will see everything in both.

If you want to keep them both separate, do step one above but instead of pasting it over top of the outer runtime, go up one level to the same directory as the outer runtime and make a new Folder with a descriptive name, like "Daz Stuff". Then put the cut runtime in there. Make another new folder and put the other, outer runtime in it and name it something else descriptive like "Poser Stuff". Then link both runtimes from within Poser.

Laurie