[ovirt-users] Combining Virtual machine image with multiple disks attached

I have few VMs in Redhat Virtualisation environment RHeV ( using Rhevm4.1 ) managed by a third party Now I am in the process of migrating those VMs to my cloud setup with OpenStack ussuri version with KVM hypervisor and Glance storage. The third party is making down each VM and giving the each VM image with their attached volume disks along with it. There are three folders which contain images for each VM . These folders contain the base OS image, and attached LVM disk images ( from time to time they added hard disks and used LVM for storing data ) where data is stored. Is there a way to get all these images to be exported as Single image file Instead of multiple image files from Rhevm it self. Is this possible ? If possible how to combine e all these disk images to a single image and that image can upload to our cloud glance storage as a single image ? Is this possible or Am I asking a Stupid question which theoretically not possible ? Thanks in Advance for sharing your thoughts, Kris.