that's kinda my point, if both leagues are gonna be the same, the what is the point of having promtion relegation?, you may as well have a 20 team league. If there is some financial drop in salary cap etc the promotion/relegation makes sense, but at that point splitting an existing league in half to create this scenario is hugely unfair on the teams relegated to create the second tier.
The only way I can see this working and the existing clubs agreeing to it, will be allowing the current aleague expand to 16-18 teams. Once that is achieved you allow relegation from the aleague to the second tier that is being created at present, bottom two or three drop and top team and two others (decided by playoff or just season position) come up - simple.
There is no way the existing clubs will accept being dropped into a lower division when they have finished higher than bottom of the league.
The only way I can see this working and the existing clubs agreeing to it, will be allowing the current aleague expand to 16-18 teams. Once that is achieved you allow relegation from the aleague to the second tier that is being created at present, bottom two or three drop and top team and two others (decided by playoff or just season position) come up - simple.
There is no way the existing clubs will accept being dropped into a lower division when they have finished higher than bottom of the league.