You can import tasks from another publisher by using the remote management option or you can move the entire QVPR with all tasks included.
Not to pimp my own ideas but I recently created one about having the ability to import/export tasks as XMLs, hopefully QT will consider this idea for future versions http://community.qlik.com/ideas/1832
I am also doing something similar and wanted to add that you can not use the Remote Management option when moving jobs between a V10 system and V11 - like in an upgrade situation.
Moving between a V10 test and V10 live or V11 test and V11 live should be no problem.
Unfortunately there doesn’t appear to be any help in the V11 server manual, but it is listed in the V10 manual.