HI ALL ! IN A PLANT,THE TAG NO.S OF CONTROL VALVES ARE UNIQUE,BUT FOR HAND VALVES THERE CAN BE A TAG NO. FOR 1000 VALVES THAT IT DETERMINES ALL THESE VALVES ARE SAME AND U CAN USE EACH OF THEM INSTEAD OF OTHER. AND THE PROBLEM: IN P3D U SHOULD SPECIFY A TAG NO. FOR EACH HAND VALVE ! FOR EXAMPLE : WE ARE CONSTRUCTING A PLANT AND "BA05" IS A TAG NO. FOR "HAND BALL VALVE" FOR 1/2" ~ 2" AND THERE ARE MORE THAN 100 VALVES LIKE THIS IN OUR PROPJECT TAGGED "BA05",SEE ATTACHED IMAGE.