CSV products import with multi categories not possible?

Hi,
I have exported the products from my shop. I wanted to update them all at once. How can I assign a product to more than one category? I can see in csv is only the main category shown. All others are ignored. That is a really big problem now to assign to multicategoires each product separately in the backoffice...is there a way to manage it via csv?

thankx and regards
Lukas

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