First, take a backup of the ODM files

cd /etc/objrepos
for i in CuAt CuDv CuDvDr CuDep
do
odmget $i > /tmp/$i.orig
done
CuAt = Customized Attribute
CuDv = Customized Device
CuDvDr = Customized Device Driver
CuDep = Customized Dependency
CuVPD = Customized Vital Product Database

1. How to find VG (rootvg) in ODM database:
odmget -q name=rootvg CuAt
odmget -q name=rootvg CuDv
odmget -q parent=rootvg CuDv
odmget -q value1=rootvg CuDvDr
odmget -q value3=rootvg CuDvDr
odmget -q name=rootvg CuDep