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There are various products you can use to accomplish this. here is a list of ones I have triedCisco Modeling Lab - Create for scaling to large number of devices, but licensing can be costly. It was a tough sell to get the capital for this but it have...
You need to define the secure network in the group-policy. See the following guide:https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/70917-asa-split-tunnel-vpn-client.html#s2