To import the jobs list, you need to have the permission to do that. If you also have a permission to import settings, you can specify the fields required in jobs import (the same way you do that for candidates and clients data import).
First, you need to prepare the CSV file according to these guidelines.
To start the process, open the data import option in the system.
You can perform the jobs data import exactly the same way you do it for the candidates - the full description is available here.
The uploaded CSV file is being verified before the import.
When the import starts, you will be informed about its status.
You can stop the import process anytime and get back to it later, because the full history of imports is available to you all the time (both the performed ones and the ones that were started but didn't end).