Migrate a whole project in one go?

Looking at how to migrate a whole unreal project with many assets of any kind into another project just shows me how dumb unreal still is. Because you can’t right click a whole folder with “migrate” to make a importable package of everything with all the childs & subfolders in the parent. You need to click them separately, if they are in different folders. And mostly every mesh should be in its own folder, because of a clean project structure. Unreal is the dumbest when it comes to importing/exporting. Horrible! Now how can I get a whole addon with many meshes ( a modular kit for example) into the mordhau sdk, and this in one go! ???