Yes, we can make groove on Ceramic PCB. But the technology to make groove is different from FR4 PCB, MCPCB.
As you know, FR4 PCB, MCPCB, the substrate is rigid, so we can rout to get the groove, but ceramic PCB is fragile, so we can not use rout on the Ceramic substrate. Normally, we use laser cutting to make the holes on Ceramic PCB, you may think we should use layer cutting, but it is not available, because if use laser, then it will be cutting through. So to make a tool is necessary, that’s correct, we make a tool to form the groove at the substrate stage.
