Configure your first VLAN via the WebUI.

Configure and run script as many times you need VLANs. You may need to change eth0 to bond0:

interface=eth0
vlan=5
ipaddr=1.2.3.4
broadcast=1.2.3.255
netmask=255.255.255.0

vconfig add $interface $vlan
ifconfig $interface.$vlan $ipaddr broadcast $broadcast netmask $netmask
cat > /etc/sysconfig/network-scripts/ifcfg-$interface.$vlan << END
DEVICE=$interface.$vlan
VLAN_ROW_DEVICE=$interface
VLAN_ID=$vlan
ONBOOT=yes
BOOTPROTO=static
IPADDR=$ipaddr
NETMASK=$netmask
END