Custom Admin Bar, Links with conditions

Hi, I would like to have links for the multipress user on the Admin Bar. Example - Add New Post -- I want the link to take them to THIER Subsite to make the post.

Another example would be a link to their subsite - So I need to put in a code to take the logged-in user back to their subsite.

Is there a way to do this on the Admin bar?
I am sure someone asked this before, I couldn't find it.