While splitting PDF files in multiple pdf's as per pages there is no option for Custom range pages, we can only split in single pages or one by one pdf as per our pages. there are two more options like by bookmarking or page size, but that is not really helpful for big data for professional use.
There should be an option where we can fill our pages range at once and split multiple PDF's in one click just like we do for single PDF's pages; that would be really helpful for professional workers who deals in big data.