Thanks Nelumbo and lpaniagua for reply.
So we can not get 2 birds with only one stone at the same time........!
Create a security policy first that locates end of the list then use "insert" command for re-location the policy.... My understanding is correct?
If this is correct, Juniper should need to put more functionality on "insert" command like creating L2 Vlans.
Thx,
Arx.