Hello,
there are some steps that you want do to get this.
1. Create a SVI on your L3 according your network necessity.
2. Create a DHCP scope to this network.
3. Allow this new vlan on your controller.
4. Create a Interface on your WLC that appoint to your VLAN.
5. Create a SSID and map interface created previously.
6. Test your connection.
This is so simple steps, but is necessary some other resources according each environment, for exemple: vlans, trunks, firewall rules, nats.. and others.
Hope that it helped you.
Regards,
Jaderson Pessoa
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