Dear Electrical Professionals,for suppose their are 5 motors connected under 1KWH meters, how can we trace individual motor consumptions.

1. Switch off all 5 motors.
2. Swith on motor (1) , load it fully continuously for 5 minutes . Register the meter reading (R1) . Again switch motor (1) off .
3. Switch on motor (2) ,same as step 2 . Register (R2) . Switch motor (2) off.
4. Repeat for all other motors.
Now :
We have (R1) for motor 1 , (R2-R1) for motor 2 ,(R3-R2) for motor 3 ,(R4-R3) for motor 4 ,(R5-R4) for motor 5 . All these readings are for 5 minutes , at full loading conditions.

..And if they do not all run continuously, you will then have to put a timer on each individually, so you can measure for how long each has been running at the end of the month. You can use cheap electro-mechanical counters (timers) for this, or even (very) old-fashioned electric clocks.

You could, of course go the more traditional way, and install a cheap power (kwh) meter for each of your motors. ;-)