Transfer iTunes playlist to iPhone
Using iTunes 12 you can select the playlists to copy with the following steps: 


Connect your device to the computer.
Select the icon for your device, located at the upper-left.
Select the “Music” option on the left pane.
Ensure the “Sync Music” check-box is selected.
In the “Playlists” section, check the playlists you wish to sync with your iOS device.
Select “Sync” and your playlist should sync.






In the case your problem is related to the fact the you are not able to see any playlist this answer may provide a solution for you.