SOLVED How to import quantities for products with combinations?

[robol]

Hello,
I would like to import quantities of products with combinations using the CSV file.
Now I can only import simple products and this works well (importing products, Forcing IDs and then assigning columns for ID and quantity)

However, if a product has combinations (for e.g. T-shirt sizes: S, M , L), I cannot find a solution to update the quantity of each combination (size).
I can assign new reference for each combination, but I don't know how to force import to connect those references with quantities.

Help?

SOLVED
When importing use Combinations, not products  I've used the Reference of combination to avoid duplicating

Edited June 16, 2020 by robol (see edit history)