In Sends view, you can view the sends for a track, add and assign sends to busses, and control send levels.
When you open Sends view, you see the sends that currently exist on the track. You can add sends, choose the bus to use for a send, create a new bus, and adjust send levels.
In Logic Pro, tap Sends in the Plug-ins area menu bar.
In Sends view in the Plug-ins area, tap the Add Send button 
.
The Add Send button is numbered, showing the number of the next send to be created.
Choose a bus to use for the send, or tap Create New Bus.
In Sends view in the Plug-ins area, swipe the Send Level knob next to the Sends menu for the send.
In Sends view in the Plug-ins area, tap the Bus menu for the send, then choose a new bus from the Bus submenu, or tap No Send.
Download this guide: PDF