Is it possible to limit the user's role within the Project Setup Station exclusively to the maintenance of training batches?
There is no built-in role that only permits users to perform training. Additionally, creating a custom role solely for training purposes is not feasible since training is typically automated. However, if the training is conducted manually, access to only the Project Setup Station can be given by granting the user the Project Setup Editor role.
However, please note, that with the Project Setup Editor role, the user will also be able to make changes to the project.