Yes, Poseray has a lot more in in than you'd think. Also combining objects by selecting a number of objects that should be combined and giving it a name. I often later make extra parts for an object (say a hairpiece or shovel, as lwo or obj), and just copy the path and name in the input window whilst the original object is already open, and merge them.
With DAZ figures I always set all groups to invisible, make the ones visible to combine, merge them, until all are in new combined groups, then go to materials tab and do groups to materials. You loose original textures, but they can easily be relinked by clicking on the image window.