[Thomas_AR]

Thanks for all your kind help.

So, i think i nearly have it - nice clear folder structure.

{series:'test($, strcat("_", field('series'), " - ",field('authors')), field('authors'))'}/{series_index:0>4s| | - }{title} - {authors}

But there is one problem in case of series:
If there is only one author everything regarding file structure is perfect, but if i have various authors (i have series with about 10 different authors) i get different folders for the series and the different authors.

series - author 1
series - author 2
etc.

Is there a possibility in case there are various authors for one series to make one folder like:

"Series - Various"

or something similar?
But this is not so important, i can live without the authors string in the series folder name.

Thanks again for your patience.