When heading to JR Kitashinchi Station（JR北新地駅） from JR Osaka Station（JR大阪駅）, it is convenient to use Central Gate （中央口改札） at JR Osaka Station.
It takes about 12 minutes from Central Gate of JR Osaka Station to JR Kitashinchi Station.
More details will be explained later.
Osaka Station Map
Transfer at JR Osaka Station to JR Kitashinchi Station
The details are as follows:
After getting out of Central Gate at JR Osaka Station, turn right and head for South Central Exit.
Go down to the underground using tha escalator in front.
After getting off the escalator, keep going straight.
After passing in front of Department Store Gate of Hanshin Osaka-Umeda Station, keep going straight.
You will enter Circular Plaza （円形広場）of Diamor Osaka.
After crossing Circular PLaza of Diamor Osaka, go diagonally forward right.
Keep going straight, and you will see the JR Kitashinchi Station sign in front, as shown in the photo above.
If you turn right, West Gate of JR Kitashinchi Station will come into view, and if you turn left, East Gate will come into view.