Inserting two chassis in same project in RSlogix5000

Dear Sir,

I am using RSlogix 5000 V17.01.00 (CPR 9 SR 1). I want to add two chassis in hardware configuration... like Chassis 1 and Chassis 2.
How can I add two chassis in same project? I am unable to do it.
Can anyone please guide me for this?

Thanks,
Shailesh

You will need a communications adapter to get to the second chassis. Do you already have a network card planned for the first chassis?

Yes you need comms cards in both racks.
See attached picture.