To maintain tasks in SAP, use transaction code PFCT to access the task catalog where you can create new tasks by entering an abbreviation of up to 12 characters and a name of up to 40 characters. You can then assign existing tasks to jobs by using transaction PO03 to access the job maintenance screen, selecting the relationships button, creating an infotype with relationship type B-007 and object type T for task, then selecting and saving the tasks to assign.