Need a smart advice on creating category tree

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Hello dear people of Prestashop community,

I have a problem with creating a category tree. I cannot figure out how to do this the smart way.

The story:
Basically what am I doing is a auto parts shop, but it is specialised for one make. So lets take Audi as an example. I want to create it like this 
[parent] Audi A4
[sub1] Audi A4 B6 1.9TDI 96kw
[sub2] Audi A4 B7 2.5TDI 112kw
[sub3] Audi A6 C7 2.0TDI 132kw 

I already did that and had no problems, but now I need to make subsub category inside:

[parent] Audi A4
[sub1] Audi A4 B6 1.9TDI 96kw -> [subsub] Engine parts | [subsub] Headlights | [subsub] Body parts
[sub2] Audi A4 B7 2.5TDI 112kw -> [subsub] Engine parts | [subsub] Headlights | [subsub] Body parts
[sub3] Audi A6 C7 2.0TDI 132kw  -> [subsub] Engine parts | [subsub] Headlights | [subsub] Body parts

I have tons of categories and subcategories and it would really take a very long time to add all these subcategories, I need a way to do it the fast way? Any advice? Maybe I should change the tree somehow?