[kicad-users] two supply voltage and Vcc

[yamamaya_com]

Hi all,

How can I use two supply voltage like 5V and 3.3V as Vcc?
For example;
U1 is low voltage device, and its Vcc is 3.3V.
U2 is TTL level device, and its Vcc is 5V.
I connected "+3.3V" power port to Vcc of U1, and "VCC" power port to Vcc of U2. 
But as the result of it, +3.3V line and +5V line had been connected directly in 
the netlist.
Please advise me!