In general,
- on your "core" switch/router, create the VLAN, then create the VLAN interface, giving it the IP address you've chosen as the default GW for that subnet.
- configure that VLAN on the correct trunk(s) from the "core" where you want that VLAN to go
- configure that VLAN on the trunk(s) into your edge switch(es)
- configure that VLAN on the edge switch ports where it is required