There is displayed one big advertisement portal.
The complete content is separated by categories.
Each category has unlimited number of dependent subcategories.
Each subcategory has unlimited number of published and unpublished ads.
Ads can be found by several panels with different filters for classification.
All that is tracked by strong system for publishing ordered advertising content which can be controlled for each category separately.
Portal in the background has strong administration panel. It can use unlimited number of roles with different permissions. Of course each role can have its own menu dependent of permissions.