Category as maincategory and at the same time subcategory

[Chigolo]

Hey guys,

is it possible to have a category as maincategory and at the same time as subcategory?

For example:
SHOP Cardio (maincategory)

SHOP - Sport (main) - Cardio (subcategory)

Is there any plugin or module?

My shop is running under Jommla 2.5.17 & VM 2.0.26a.

Would be glad if you could help me.

Thx