malshayeb If you are using the Accelerator you can create a custom solution, add a custom Project ID field that auto-generates a unique id and add it to the Project, Summary form. However, for tasks this is not an option as Microsoft does not allow you to create global custom task fields. Hopefully Microsoft will add these to the tool in the future as it really limits practical use when you can only rely on Project Name or Task Name, which can change. it would also be useful if they would require Project names to be unique and limit some of the allowed characters that can be used in a name, similar to MS Project Online.
