Hi Ishaik,
AFAIK, there is no 'no proxy-id' - definitiely not on the Cisco boxes. If they had configured an accept-all proxy-id, then your VPN would have some up whith 0.0.0.0/0 as proxy ID.
If you want to test, just try injecting traffic for a new remote subnet (say 10.0.10.0/24) into the VPN by setting a route for this subnet pointing to tunnel and adding the permit policies as required.
If it comes to configuring new proxy-IDs, yes - you are right. Every proxy-ID pair will bring up its own SA.