Dynamic sublists / sub-lists / sub lists

Most of the time, when dividing tasks among sub-group of a bigger group (like frontend and backend), we are going to separate them into subsists for organization. We can create tags to differentiate tasks and then split them into sub-lists. However, adding tasks to the main list, will not move them to these sub-list, what I recommend is having some sort of dynamic sub-list which always up-to-date regarding the main list and the filtering criteria.