[slb]

Yes, I am aware of that but, what I'm wondering about is how to make a custom column series_sort (like you can do for author_sort). That would make of for example The Witcher, the value Witcher.

With view manager or sort by you can prioritise sorting, do multiple.

But because sorting of series is done immediately for both series_sort and series_index, the secundary sort has no effect other than putting Dutch/English/Dutch/English... or English/Dutch/English/Dutch (example previous post, what i get). And if I start to sort with language, then the series isn't grouped together anymore, there are then several large groupings of the same language.

To be able to get the grouping I want, I need to be able to sort like: high priority -> low
series_sort (custom column) -> languages -> series_index (custom column, this I know how to make)