Two or more Booktables?

It is not possible to have two MyBookTable installs on the same site.

The recommended way to achieve what you want is instead of directly linking to your Book Table Page on your menus and sidebars, which will list all of your books, link directly to the Author pages, which will list only the books of that particular author. It will still be possible for users to find the main Book Table page that lists all the books together, but prominently displaying the author pages as separate is usually enough to clearly denote separation for most of our users.

If you absolutely need stronger separation than this, the only solution is to extend the MyBookTable functionality with custom PHP development.

~Tim