Drupal - Advanced Search

My client needs their Drupal search functionality modified to allow for more advanced capabilities. The clients site stores many documents that are uploaded by users. The search engine must allow users to search these based on categories and sub categories. The document upload system will be changed to allow for assigning of these categories and subcategories at the time of upload. The search function will then allow users to choose these categories along with their search term to narrow their results. Please see attached functional document I have made. It contains details of the search function. ## Deliverables The following document explains the requirements for the search functionality in further detail. Please reference item 4 of this document under "Development Summary" and "Detailed Development Approach".