All the options for starting an import in TMS are listed here. The options you have depend on which import type you have chosen (project or individual import, import all requests, transport workflow).
If you want the import to start immediately in a dialog, choose Immediate.
If you want the import to start at a later time, choose this option. The import is scheduled as a background job in the target system. If you enter a date and time in the field No start after, the import is started in the time frame between Planned start and No start after. If there is no background process available in this window, the import will not happen. If you want the import to be performed regularly, you must choose a period in the field Period using the value help.
The Period option does not exist for single transports and the transport workflow.
If you want the import to start only after an event is triggered (see
The Execute import periodically option does not exist for single transports and the transport workflow.