Yeah, it's really about recognizing the relationship between the balls and between the OB and the pocket. See where the CB needs to be in order to send the OB to the pocket, then using your cue stick you send the CB to that location.
Most pros started off like everyone else, using ghostball (aiming the center of the CB to where it needs to be to pocket the OB), or they used fractions (aiming the center of the CB toward a specific fractional aim point on or near the OB that would result in the CB arriving at the appropriate location to pocket the ball), or they used contact points and parallel shifting to center CB, etc...
In each of these methods it's a pretty basic thought process -- look where the CB needs to be, visualize a path/line to that location, then shoot the CB along that path/line. After a while some players get very good at it and excel beyond the pack into pro-level ball-pocketing skills. It doesn't make them pro-level players unless they excel in other areas of the game, like CB control and strong mental skills.