I already have a Drupal 7 website. I want to extend it to a second one. The first one is stored in a subfolder. I want to create a second subfolder to store the second one. At the base I will have an intro page which will redirect to either the 1st or the 2nd one. I do not care for different domain names. I just want different content (different menus) and slightly different template. Also same users same admin. But I would like the search to be site related.
What is the easiest way to do this? Should I create a 2nd databale or use the Domain Access module? If I create a 2nd database how can I have shared logged users? If I have the same database how will the admin be able to update each one separately (assign nodes to sitesa) and should I override the search module to only query site-related content?