Hi. ... You English is good enough. No apology necessary.
But, just in case there is someone that can help you, and they do not quit understand what you wrote, I will help.
BY hadoancuong:
In the editor, I place one unit as the player, linked to the High Command Module,
I place one group (or squad), with the Team Leader as playable,
in-game, when I switch to the Team Leader, then back to the Commander, I can no longer command the Team Leader,
I need to be able to switch back and forth, and still be able to command the Team Leader! Please, help.
hadoancuong, just using the editor, I do not believe you are going to be able to do this. (BTW, I have not used that scenario in a long time, so I may be wrong.) I have never tried to 'fix' this with a script, but maybe it is possible. I would think it would be. After all, in Warfare, a player can be a Commander, then give up command to the AI, and the AI has no problem taking over command.
In the editor, you do have the command module linked to the player, right? Check the wiki on setting up the command module, you may just need to also link the group to the player (commander).
EDIT:
High Command (The subordinate logic is what I was thinking about.)