Converting relations to ways


I am looking for a program that would allow from an offline OSM file to convert all relations to a single way made of a merge of all the ways from the relation and transfer all tags to that way.


You can use Qgis. In Qgis you download the relation you want to merge. Save as polygon and then *.shp

Back to JOSM you use the Open Data Plugin to charge the *.shp file. The file will charge as a way. Copy tags from the relation to way.