How do you group shared sheets into separate projects?


I have just shared a 6 sheets for a new project to a colleague that is working on the project with me. They can view these sheets in the "sheets" folder. I now need to create a new project for a different customer but also share the sheets with the same colleague as they are also working with me on that one too. However that colleague will open up the "sheets" folder and see all the sheets for both projects in one list! So will see 2 x Project plans, 2 x Tasks lists, 2 x Issues Logs etc. is there a way to group the sheets for them into a project folder or something? Thanks