Thanks! That worked.

Here is a screenshot of what I have done so far.

In the Files section it is possible to show the changes but I did not find an option to create a patch out of these changes.

I'm not sure about your suggestion about the stash. Normally I would stash changes which I haven't commited yet. Could it also help me here to create a Patch and if so how?

Thank you for your suggestions. I have already commited the changes to my local repository but did not push the changes. So what I want to do is to create a patch file which includes the changes from several commits (in my case from the last pulled commit to my current local head revision).