I want a category forwarding/connecting/jumping to another category

heres an example:

cars@

and this would take you to another category

How would I do this ?

I beleive you want RELATED CATEGORIES.

Click on the category you want the related category to appear under first. Then click 'Related'. Then you can click on the category you want to appear under this relationship.

There is an explanation in the manual also.

You can name the new category relation to whatever you like also, it does not have to be the same as the category it is referring to.