Via in Kicad connecting multiple layer?

I am designing a four layer board in Kicad. The layer stack up is as follows:

1. SIGNAL
2. GROUND
3. POWER (3.3V)
4. SIGNAL

Now, i want to connect decoupling capacitor to SMD IC's. The decoupling capacitor is placed at the opposite side of the board. So, i am looking to get a via which connects TOP layer (where IC is soldered), POWER Layer and BOTTOM Layer. If it is not possible or it is not a good technique, then how can i connect decoupling caps and IC's Vcc when they are at opposite side of the board.

Should i have copper pour on TOP and BOTTOM layer of the board and should i connect them with GND or Power?