Link one category to multiple categories?

its easy to link one product to two categories
is it possible to link one category to two categories?

i have subcategory A in category B, now i want the link of category A display both in category B and category C (for the categories listing page, also for the categories sidebox)

Zen Cart doesn't provide an option to link CATEGORIES into other CATEGORIES.
It does allow you to link PRODUCTS to multiple categories.