Hook products from specific category to other category

[mbp]

I have universal accessories in a category. I would like to add these products to other categories automatic. It would be great if these products appear at the bottom on the "hooked" category.

 

I'm trying to avoid to add universal accessories to new categories one by one.

 

Example :

 

IF category id = 1, 2, 3, 5, 

add products from category id 6 

 

Does anyone know how to proceed? Is it possible to achieve this by adding an if statement in product-list.tpl? Or is there some kind of module for this that I yet not discovered?