Hi there @KlausKleber
Simply put, no it's not possible to specify an Author or Bank name upon saving your ANA 2 Presets from the Plugin GUI itself, that's why you didn't find any tutorial about this.
You could create a new Bank by adding a new folder at the root of the "Sound Presets/User" folder, you will need to have a preset inside this new folder in order for the Bank to show up in the Presets Browser.
-> so that will be ...Presets/Sound Presets/User/My Bank/My Preset.SndPr
But even if you do this & have a new Bank showing up in the browser, it won't be displayed as an option to save your Presets, the only option is the default User Bank.
As for the Author name, it's also not an available option for tagging your Preset, the Author name is embedded into the Preset.SndPr file and you will need to edit it in order to add the new Author.
Other parts of ANA 2 patches like Wavetables, Arp, CMD & G-ENV Presets get saved inside their specific locations & files format too, so if you import your own samples into ANA 2 Sampler OSC, if you program some custom Arpeggios or chords with the CMD feature, all the necessary files will be saved in their specific locations & formats when you use the "Save As" option from ANA 2.
So if you plan to design presets for ANA 2 and want them to work fine & being tagged with new Bank, Author, Categories...etc you will need to have a good understanding of the files types & locations inside the ANA 2 Presets folder structure and that will require some post editing of those files.
So unfortunately there's no easy way to achieve this, you'll need to spend some time to understand what's making a full ANA 2 Patch, which files & where they have to be stored.
So that could be a lot to take care about if you just want to save your own presets, using the default feature from the GUI is the best option then. The Presets Browser also allows you to edit "User Tags" ( you can add/delete your own User Tags from the Presets Browser".
Now if you plan to make ANA 2 Presets Packs for release then you will need to go through the above. Should you need more information about this, I suggest you to get in touch with @phil_johnston from S.A team.
And that said, when it comes to Presets Packs release, bear in mind that any Preset Design work requires you to start from the INIT patch, reverse engineering, copying/modifying existing presets is an infringement to author's rights & EULA granted with ANA 2 ( but that's the rule for any Soft-Synth anyway which anyone has to respect when doing sound design ).
Hope this could help to understand some basic about ANA 2 Patches & Presets structure, it might look cumbersome but many other soft-synths work in the same way, you' ll need to learn & follow some files structure & data in order to implement them properly, there's often some extra work that need to be done next to the sound design itself.