modify media management php script to include sub-categories.

I need to purchase a media management php script that consist of 3 parts (audio, video, photo) but it doesn't have an important feature which is sub-categories. The script is on the following url: <[login to view URL]> ## Deliverables The php script we need to buy consists of 3 media types: 1- video 2- Audio 3- Photo We need to be able to to make several categories and under each category. I want to include sub-category which is (artist) and under the artist I include (album) and under the album I add (songs). Category 1 (ex:I can give a name to this category) Under it (artist1) Under it (album1) Under it (song1, song2, etc) Under it (artist1) Under it (album2) Under it (song1, song2, etc) Under it (artist1) Under it (album3) Under it (song1, song2, etc) Then (artist2), etc... Category 2 category 3 So I need to update the backend which will let me add the files into their categories, artists, album. Also, in the front end, the visitors can select the category, artist,album and songs to listen to the songs and have the ability to upload their own files through a multi-files upload system. The categories along with sub-categories should be fully searchable in the control panel and in the main site and the language should be unicoded that has the ability to recognize other languages. The above is needed for audio, video. As for the photo management: I need to make sub-categories under the main categories as indecated before. The script has a plugin that let you import any videos from youtube, google, etc. So as part of the above job, we need the plugin to be linked with the categories so if somebody wants to add videos from youtube and others he can select the proper category and submit the video link to be grabbed to it. At the end, the programmer need to make sure that any related sections in the script need to be linked with the above required modifications. please refer to the following url to know the features that might be affected from the modification of the categories: <[login to view URL]>