Deleting files and create new team areas

Hello, I have two questions about the area "my data". There is a place called "Meine Teamarbeitsbereiche", in my understanding this is the place where my projects get saved. At the moment there is one subcategorie named after my first projects. In this project are some files, which i want to delete, how can i do this? Second question is, now i want to start a new project, but when i am saving the new project, it will be part of the old one, so how can i open a second team area for the second project?

Hope you can help me:)