Texas BPL Pilot Project

Below The Conference, the league splits into two, divided by geography. Are the bottom four teams all relegated, with the two northernmost teams to the northern league, or do the two bottommost northern teams get relegated to the northern league, or are the bottom four teams relegated with teams moved from south to north or vice versa if necessary to even up the leagues again? Or something else?
To clarify:
Suppose the bottom four teams in the conference all happen to be within five miles of Scotland. Are two of them thrown into Conference South anyway? Are they all put in Conference North, with the southernmost teams from Conference North transfered to Conference South? Are two of them spared, with two higher-ranking but more geographically diverse teams relegated in their place? In short, how is it decided to which of the two lower conferences a team is relegated?

the split is between conference north and south(step 2) which are regional feeders one step down from the conference(step 1). This was all introduced in 2004. This is all part of the non-football leagues. The 3 bottoms teams of both north and south are relegated to step 3 leagues(unibond league northern premier division, southern league disvision and the isthmian league known as the ryman league). from 2007-2008 season. conference will be known as Blue Square Premier league and north and south respectively