After having the Assistant create lines....
 

After having the Assistant create lines and Assistant set up organization in the AHL then clearing his lines, I cannot set the lines myself. I would like to as he put Pavel Zacha on RW and his RW rating is 12. I would like him to stay at RW

You can't set AHL lines manually.

If you set the farm team to emphasize potential in its lineup choices, a young guy like Zacha will be more likely to get used on a higher line (and in his usual position.)