Currently it is not possible to merge two Tours within komoot. What you can do is download the Tours you want to merge as a GPX file and use an external serve to merge them. How you download the GPX files of your Tours is described in this article: Export and import of GPX files
Having downloaded the files, you can for example use a website like this one to merge the files. Afterwards you can upload the Tour again to your komoot account.
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