Sample configuration
tunnel-group Employees type remote-access
tunnel-group Employees general-attributes
default-group-policy Employees-GroupPolicy
tunnel-group Employeesl webvpn-attributes
group-alias Employees enable
group-url https://vpn.test.com/Employees enable
tunnel-group Contractors type remote-access
tunnel-group Contractors general-attributes
default-group-policy Contractors-GroupPolicy
tunnel-group Contractorswebvpn-attributes
group-alias Contractors enable
group-url https://vpn.test.com/Contractors enable
Same can be configured from ASDM as well
Connection profile settings-->Advanced--> Group Alias/Group URL-->Add
