Can I operate 2 HPLCs with 1 computer?

Yes..

You can do.

In one chemstation, you can configured two hplc as instrument 1 and instrument 2.

You need network switch to connect both hplc and that switch will be connected with computer.

IP etc. configuration, you can check or can take support from your local agilent.

Yes you need to contact local Agilent as two HPLC to run on one pc may be extra drivers also required with your software