I'm not sure I understand you? I will try to explain the correct terminology to you: You partition a disk, you create a physical volume(pv) from that partition, you create a volume group(vg) using a physical volume(pv), you then create a logical volume(lv) in the volume group. You can extend the logical volume(lv) if you have space left in your volume group, if you don't you have to create another partition on your disk or on another disk. You can then create that into another physical volume and add that to the volume group(vg) you want to extend. Once the volume group is extended you can extend the logical volume(lv) of your choice.