Is it possible to create sub-node that can assign on a node? The idea is to create a chapter(sub-node) that can assign on a book(node:page). I know this can be done with taxonomy, but I dont wanna have 1000+ of taxonomy on my site. Is it possible, if so, how?
Do you mean you want a Book that has chapters and you want them linked like a book? There is a module for that in Core called book. https://drupal.org/documentation/modules/book