How to link category to another category?

[Lenc]

Is it posible to somehow do that?

(those categories you can see in shop)
category A

- subcategory A1 (link to M)

- subcategory A2 (link to N)

- subcategory A2 (link to N)

category B

- subcategory B1 (link to M)

- subcategory B2 (link to N)

category C

- subcategory C1 (link to M)

- subcategory C2 (link to N)

- subcategory C3 (link to M)

- subcategory C4 (link to N)
...

(those categories you cant see in shop)

category M (not visible)

- subcategory M1

- subcategory M2

category N (not visible)

- subcategory N1

- subcategory N2




So I need all the sub categories from M in A1, B1, C1 and C2. All others must be connected to N.

Can anyone hel me with that, please??