In the circuit schematic below, on the right side, I am to allow for the distribution of three voltages. The three voltages on the right are +5v, an adjustable 3-12 volts, and an adjustable -(3-12) volts. Below is the circuit schematic I have so far and the diagram of the circuit i'm trying to replicate. I'm not sure what circuit component to lay down to allow for an outside source to jack into the voltage the various voltage regulators are putting out. Any suggestions?
https://imgur.com/a/vUx8k
https://imgur.com/a/MMNBY
https://imgur.com/a/vUx8k
https://imgur.com/a/MMNBY