I do the morphs on a comlex: R&L Collars plus chest in RDS opened as a single mesh. Still only doing the morph on one side. You must then remove the chest in Compose, leaving the 2 Collars. You can also isolate a copy of the morphed collar at this point. Open the 2 Collars in MirrorMT and mirror the morph. Now, because Compose will not accept the stripped morph that comes out of MirrorMT , it is necessary to copy the "v" data from the mirrored file and paste it over the "v" data in the pre-mirrored file. Compose will accept this and allow isolation of the mirrored Collar morph. This is also a method that works for the Buttocks. ( I have had nothing but bad experiences in using the export function in Poser as a source for groups for morphing. ) They move or scale and I can cut-n-paste more quickly than it takes for Poser to open.