Maintain Current Page When Updating Top Level Parameter In MVC?

After working on a page for quite some time, the customer now decided that they wan't to be able to change a top level setting but still maintain the current page they're in.

Say for example:

User goes to default page, clicks on the UserSettings which is loading a partial view. In that partial there is multiple links like Address, Password, Other. Click Address (any of these) and it will load a partial within the partial. This will of course maintain the link "MyProject/User/1" in the URL bar.

When the User now change in the drop down in the top level, from User 1 to User 2 this will update the URL to be "MyProject/User/2" and will load the matching action with that. However, I wan't to be able maintain the user selection from before (MyProject/User/2, click UserSettings, click Address).

If I knew this from the beginning I would have done it completely different, but this now a request from the customer after the project is done so I'm look into if there is any "easy" way

[code]....

I can also add that I've tried to do something like this to figure out what exact page I'm on:

var foo = window.location.pathname;

but that only gives me what ever I already have in the URL bar, and not any information about what partial that potentially would be loaded. Is there any way to see what partials is dynamically loaded at the moment?

Basically loading View -> Partial View -> Partial View. Changing the setting for the View but still want to maintain View -> Partial View -> Partial View, but now for the new User