But is there any limit to build back links for any site/directory to get PR for inner pages ? or can build n numbers of link?
1. Get external backlinks to point to your internal pages 2. Get your homepage to point to your internal pages
Get high quality backlinks to the inner pages. It's also important that you write good quality content which will help you get natural backlinks.
One of the best technique of internal linking is Deep link directory submission Internal linking in your website. Put internal link url in forum signature.