category page results by group

hello, i’ve come to a roadblock once again for a webpage im building and i needed some advice with the following issue..

i’m going to give some examples so maybe i can work this out and make it easier to understand my problem…

-i have a main category called “services”… that category has 3 subcategories calles “mechanics,” “food” and “education”…

–now mechanics has 3 subcategories of its’ own… “parts,” “aircondition” and “wheels.”

–food has 4 subcategories of its’ own… “sushi,” “fast food,” “diet” and “etc…”.

–and educatgion has 3 subcategoires of its’ own… “highschool,” “colleges” and “particular.”

now the thing is that i want each of those category pages to display separately it’s results by groups… so the mechanics cat.page will have 3 separated groups, first “parts” with its’ results, then “ac” with its’ results, and finally “wheels” with its’ results…

i’m tyring to do this the most effective and dynamic way since categories will be added and deleted as the company evolves… i’ve had the site running but coded it manually and it’s too much of a hassle to make chances when categories are added and deleted…

any thoughts or ideas where to go from here?