How to get Team (Make a Cup qualifying Like Europe U21 Championship Qua.)

[that\'s play soccer]

I wanna make a Cup qualifying Like European U21 Championship Qualifying.
So i refer to the rule of European U21 Championship Qualifying in database.
It have group stage 0 with 9 group at first. Top team will qualified. Then It will get group second teams to stage1 league to rank. it would get top 3 to qualified. and 4-9 teams go to playoff.

Here is my problem: stage 1 league would change team table after stage 0 position change. (ex. Group A second team is San Marino at first, after next group round,  France become second, the league table would also change San Marino to france ). The stage 1 was created when stage 0 created. but original rule didn't show the stage 1  how to get team. If i use "get league stage team", the table team is fixed. not like original designed. So i try let it empty and run. it showed stage 1 have no teams. ( Get stage 0 teams is not problem ^o^)
Anyone can teach me how to set best 2 group team league like this comp. ?  Plz.

Edited December 14, 2021 by that\'s play soccer