The excel-vba code for mailmerge single documents I copied from your suggested sticky thread is giving me word docs for every entry, also for those that have value 0 in column A (although they are kind of empty, they are still there) and I dont know how to change that
The IF-fields are kind of hidden in the text that should actually follow after the IF... see here for example:
https://imgur.com/a/DupAVkf

That makes it kind of hard to keep an overview... Sadly I cannot paste the text into excel cells because of formatting and length

At least i tried that before and it didnt take all text into word only the first sentences.
I tried to save Auto-Text and insert that after the "{IF{MERGEFIELD Anz}= "1"- expressions but it inserts only the text. Would be great of there would just be any fieldcode/field/cross reference or whatever and the full text only be shown when exit the Alt-F9 view by pressing F9.