RE: try to crack this one !!!

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You should be able to do it with CSS style sheets. You would need to create a custom class to assign to each sub-category item. 

For the pages on which you want the specific subcategories to appear, you need to start by using a seemingly backward CSS property: for every subcategory, set the display to none. In the header of each Category page, you need to link to a custom stylesheet for those pages only that sets the visibility of each subcategory you DO want to appear to block. This makes them appear. 

This linked stylesheet is also a good place to change the image or other properties of the current Category image/text as well to denote visually "you are here" and setting each category link to have a custom ID that can be styled specifically.

HTH, 
Ryan