Design large web form for entry mode

Question

At my company I am developing and designing a web app(one man effort :( ) for entering data for a directory , basically the directory structure is as follows :

Categories 
  -> Offices (>=1)
    ->SubOffies(>=1)
       ->Addresses
       ->Phones
       ->Boards
       ->etc

So current implementation has different screens for the user to enter the data , but I think hard for the user to keep track of the data entry with different screens and I decided to put all the screens in one big form but now I am confused.

What is the best way to do something like that?

Answer 1

Perhaps a JS accordion form?

One such example here: http://www.i-marco.nl/weblog/yui-accordion/form/