Hey Javier,
welcome to the community! It’s been a few days – did you get any further with this? If I assume correctly, your Iterator module produces the bundles which in the output of the Airtable module are listed as Operations 1-4. You can filter for a specific Bundle from the Iterator which corresponds to the operation in Airtable (the Iterator always gives you a IMTLENGTH and IMTINDEX (Total number of bundles and bundle order position) which can be used for further filtering.
On a bigger picture, if dynamic document creation ist what you are after, maybe take a look on this post, I gave an outline on how I achieve this by using the “Text Aggregator” module and html snippets.