@Martin-Wilcke I browsed the forum to see if others already suggested enabling a more natural way in MRA for planning multiday trips. You suggestion comes close to my wish:
I create a new folder and would like it to contain the POI's and routes for a series of days. I first want to enter all overnight stays as POI's, so I can use them as endpoint for a day trip and use it again as a starting point the next day.
A workaround is to define all trip POI's as Favourites but this means various multiday trips share alle POI's, unless you remove them from the list again afterwards.
I read here that new POI functionality is coming. My suggestion is enable POI's for a series of routes to be put in a folder just like the routes itself.