PCB123 does not have tools for panelizing boards. If you want to order a panel of a single pcb you can go directly to the Sunstone Printed Circuit Website
with your completed layout and order through our PCBpro service. There you can fill out the online quote form. To get the boards panelized you can select on of the routing options (not the individual option). If you have specific panel requirements you can include notes on the mechanical layer of you PCB123 design. Since you boards are smaller that 1.5" x 1.5" (this is the minimum size for vscore) you can select either tab or tab w/perfs. Please feel free to contact me if you have any questions.