Hello Kunal,
I am assuming that you want to remove the proposal and policy for these VPNs as well. If not, start from point 2:
1)
delete security ike proposal Dyn-VPN-Proposal
delete security ike policy Dyn-policy
delete security ipsec proposal Dyn-ipsec-proposal
delete security ipsec policy Dyn-ipsec-policy
2)
delete security ike gateway Dyn-gateway
delete security ipsec vpn Dyn-VPN
delete routing-options routing-options static route 10.0.0.0/16 next-hop 192.168.70.1
delete interfaces st0 unit 111
Also you will need to delete this interface from whichever zone you have made it part of.
delete security zone security-zone <name> interface st0.111
Regards,
Rushi