Manually addition of subdisk in vxvm

Hi,

We have to some space in the disk, and we found that in our environment, one subdisk is using in two volumes which is under same disk group (Vaultdg)

We have found out one subdisk which is free and can be added manually.

Shall we proceed to add it,if so then how do i proceed?

Command please to add it forcefully as normally it is not taking

Quick reply appreciated, as have to do as soon as possible.