How to actually make an existing listing available in EU marketplaces?

I’m being told different/contradicting things to do this. I have been told specifically not to run the BIL for the SKU as I have previously ran the BIL for different SKUs and running it again could ruin them.

The ‘Manage offers in other marketplaces’ section has multiple countries greyed out which I need to make them available. I am told to add them manually to the country but I both need to ensure it’s the same ASIN and I want Amazon to run it through their translation system, as I don’t know all the languages. If I create them manually I will only be filling them out in English.

I’m not sure how to do this properly. Some ASINs are working in some EU markets but not other markets, some ASINs are only currently working in UK.

Any advice is welcomed.