Templates and menus assignment in the case with some subsites.

Hello StackIdeas staffs,

I'm now constructing a website using Easysocial, Payplans, and rockettheme templates.
I have an issue I can't solve by myself now.
It is a little bit complicated. I'm not sure I can explain the issue in my English clearly but I try to do it.

I have 4 subsites in my website with different templates and menus using rockettheme gantry5.
subsite A-en (en-GB) ---This is the site for people with easysocial profile type p-A-en (with Joomla user Group usr-A-en)
subsite A-jp (ja-JP) ---This is the site for people with easysocial profile type p-A-jp (with Joomla user Group usr-A-jp)
subsite B-en (en-GB) ---This is the site for people with easysocial profile type p-B-en (with Joomla user Group usr-B-en)
subsite B-jp (ja-JP) ---This is the site for people with easysocial profile type p-B-jp (with Joomla user Group usr-B-jp)

I'd like to make the users to use the website in one template and menu not redirecting to other ones.
I made easysocial login menu items for each menu, A-en-login, A-jp-login, B-en-login, and B-jp-login.
I then made a test user for A-en and logged in from the menu A-en-login.
At the time, the user is redirected to the subsite B-en.

I set the menu template style for A-en-login to the template of A-en.
I also set the login redirection of Easysocial->Settings->Users->Authentication to "stay on the same page".

How do I set the menus to make the users to their own area?
Please give me a hint if you have some.

Best,
Kenzo