Feature Request: Implement logic of Google Drive Sub-Folders

It would be great, if I could share every sub-list with all sub-tasks like a project to other people. These people should only see their shared sub-lists with all sub-tasks.

By doing this, I still want my sub-list in my task-tree, where it belongs. (If you want, you could create an additional project, but not necessary.)

The logic could be just like Google Drive Sub-Folders. If I share a folder (here sub-list) with sub-folders (here sub-tasks), it still stays where it is in Google Drive, but the receiving party can see it in his shared folder (here project) and move it where he wants it to be.