1) Does the Pin Code work like a directory structure such as I can assign
a pin number to [abcd] say "101" and it take me there to dir [abcd] then every thing in that dir tree can now be access by entering in a pin number from the remote.
Say like 1001 for the first album in that tree,etc

No. If 101 is assigned to abcd, then entering 101 will immediately start playing the entire contents of abcd.

Peter