Ok I think it may be best to settle the issue of my pc's itunes backup situation first which is a simliar issue with my macbook, this time listing my steps:
1] On My desktop pc, in itunes 11, I created a number of playlists with names like 1946-1969, 12 inch 80s, reggaeton e.t.c e.t.c with the actual mp3's located on my connected external HDD in a top level folder titled "collection", inside this folder are the categorized mp3 folders with names like 1946-1969, 12 inch 80s, reggaeton e.t.c e.t.c, so you get the picture, I created the playlists to correspond to the actual mp3 folder's names.
2] I then copied the .itl and .xml files from the itunes folder on my pc located in C: Users/living room/music/itunes [as shown in screenshot] and pasted unto a flash drive for backup purposes.

3] I then uninstalled and reinstalled itunes 11 on my pc then replaced the new itunes .itl and .xml files with the backup files I had copied, now all playlists are showing and when I click on any playlist the files are showing in the library but when I click on any song, it's asking for the location of the song file, this where I am at a standstill and cannot go any further, I need to know how to link the playlists back to the songs still located on on my external HDD?
If I can solve this issue above then I think I should be able to soklve the transferring to my macbook issue?