Multiple Lamp indicators and LED driving using TPL7407LA simultaneously
Yes it is possible to drive multiple lamps and LEDs. 
The maximum supply we can provide is 30 V as per below table. The minimum voltage needed to signal a logic high is 1.5 V which I believe your PIC microcontroller will definitely provide. The driver is 1.8 V to 5V logic signal compatible.


Care also about the current you can sink via this Low side driver. Per channel it allows upto 500 mA but it depends on the package and also on number of simultaneously switched loads.

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  At any input voltage the output drivers is going to be driven at its
  maximum when Vcom is greater than or equal to 6.5 V."
  
  So does it mean if i supply Vcom pin greater than 6.5v it will be able
  to drive connected loads which are of 12v and 24v respectively ?  


Yes. For any logical input voltage level, be it 1.8 Vor 3.3V or 5 V for example, the loads will be driven with complete supplied voltage (when higher than 6.5 V). Hence, the lamp indicator will be definitely drive with complete applied voltage of 24V.