Promotion/Relegation League w/Feeders

[verbal13]

In all of my years of playing OOTP, I've never setup my own league with either promotion/relegation or feeder teams. So I'm looking for some guidance from those that have done this before.

The format I am trying to go for is a 3 major league setup with promotion/relegation between the 3 major leagues. Additionally, I'm trying to setup feeder leagues to, ideally, support the vast majority of players to going into the major leagues. My questions are the following:

1.)For promotion/relegation leagues, how did you setup the draft or free agency? Is there a way to set it up so that Free Agency is shared among the three major leagues? So Free Agents can sign with any of the leagues at the same time?

2.) How are the Amateur Drafts setup in leagues like this? Does the top level league draft first and everyone left is drafted by the second major league and so on?

Thanks in advance for any tips you can share!