Use the search bar with the word 'spit' 'split' and you find some similar questions, e.g. [https://help.openstreetmap.org/questions/14151/split-osm-file-without-fragmenting-ways-and-relations][1] [1]: https://help.openstreetmap.org/questions/14151/split-osm-file-without-fragmenting-ways-and-relations

Use the search bar with the word 'spit' and you find some similar questions, e.g. [https://help.openstreetmap.org/questions/14151/split-osm-file-without-fragmenting-ways-and-relations][1] [1]: https://help.openstreetmap.org/questions/14151/split-osm-file-without-fragmenting-ways-and-relations