Inquiring about adding my wife and my daughters as dependent but they are not in USA yet.

Hi,

I have an inquiry about my tax...I have L1B visa I arrived alone on March and filled my W4 as married with joint filling..but My wife and my daughters did not come yet to USA but they have L2B visa..when I file the tax how can I make them dependent if they did not enter USA and did not have any SSN ?

 

regards