Hi,
Create an object-group and mention all your private ip address.
Example :
object-group network privateip
description private ip address for internet
network-object host 192.168.50.10
network-object host 192.168.50.10
network-object host 192.168.50.10
network-object host 192.168.50.10
network-object 192.168.1.0 255.255.255.0
nat (inside) 2 access-list privateip
global (outside) 2 220.223.23.24 255.255.255.255
Try this..
Uvaraj