How to update an array with data that matches another array's data

Question

I am coming from a novice database programmer background, mainly using MS Access for simple database applications with forms. I am in process of migrating to Xcode and need some assistance in how to populate and update my datasource which I planned to use one big array for.

I have all my raw data from sqlite loaded into Objects: Category, Subject, Quote, Quote_Map

Category
--------- 
category_id 
category_name

subject
--------
subject_id
subject_name
category_name

quote
--------
quote_id
quote_excerpt

quote_map
----------
quote_map_id
quote_id
subject_id

I have objects for each of these tables now. Now I want to make a master data source object that has all the the following:

category_data
----------
category_title
subjects (array)

then within the category_subjects array I want:

subjects
----------
subject_id
subject_title
category_title
quotes (array)

The quotes are obviously just those that map to subjects from the quote_map table.

Before I get totally down a wrong direction I wanted to ask for some guidance on what the best way to go about this task is.

I am trying to end up with one data source that I can use for a drill down app with four views, category, then the subjects of that category, then the quotes of that subject, then the specific quote selected.

Any direction would be greatly appreciated.