S.D.

Depending on exactly how you are doing your dress, I'd recommend leaving everything above the waist in thier normal groups, abdoment, chest and l&r collars. Then you have 2 choices
either make the rest of the dress as hip or better, make a small hip group, then a single row of verts that will work with the hips on pre-made poses and act as a break so those poses don;t affect your skirt group (if you don;t do this then if the hip ios moved by a pose that movement will affect the skirt group and can give you some weird distortions). Then make everything below that as a single group, I usually use "skirt" or "dynamic" this is the group that will be clothified in the cloth room
EACH group must have a coresponding BONE in the CR2, even the group you intend to clothify, or it won;t show up when you load it into poser for the figures folder.

If this isn;t clear enough or you have any problems or questions, let me know and I'll try and help.