After i add the ip n port n select the game as condition zero n click on add server. The server is shown as HalfLife server n not as condition zero server
Need help

The easiest thing you could do is claim the server that shows as Half-Life and then adjust the game type to the correct one. If it was originally added under a different game, you would not be able to overwrite it without claiming it.

If you can direct me, I can help you as well.