Doubt with project creation in firebase

I had several projects in the firebase and when I went to create another it triggered this message: 3 projects missing to reach the limit , even though I was dropping all, which was what I did and the message continues, but a question has arisen: Can I create a project and add in this project multiple applications of different types? Type: I create this project: ProjectMain and in it I include these App's: Authorizer, Scheduling, ShoppingOnLine , can I do this? I think so, because what matters is the Server Key and the token and these are related to the App and not the project, right or wrong ?