Hi @Michael Anklin ,
Welcome to Q&A Forum!
According to your description, we suggest that you can use Dynamic filtering to achieve your needs. More information, please click this blog.
Please follow the steps:
1.Create a Site Page
2.Add a List web part and select the [Prozessinformationen] list
3.Add a Document library web part and select the [ProzessDokumentBibliothek] Document library
4.Click "Edit web part" to edit [ProzessDokumentBibliothek]
5.On the Panel, enable Dynamic filtering
6.Then, configure as shown below
7.Apply
8.Publish/Republish page
9.Here is my test:
Thanks,
Echo Du
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