Here are the step how to configure two ipaddress to one interface.

copy the physical interface startup config file:
cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0

Modify the /etc/sysconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:13:D3:A0:B4:xx
IPADDR=192.168.14.xx
NETMASK=255.255.255.0
ONBOOT=yes
TYPE=Ethernet
MACADDR=00:13:D3:A0:B4:xx

After  above step done run below command

admin@smartproteam $ ifup eth0:0