Do you know about the "spot on the wall" system? Do you know how to use the diamonds to get to a certain point (dividing the number of diamonds by two)?
So lets say you want to kick and your cueball is in the corner pocket and the ball you want to hit is on the second diamond past the side pocket, both are against the rail: count how many diamonds the cueball and object ball are from each other (there should be 6 diamond separation); divide that by two to get where you would hit the opposite rail to make the hit; level cue, center ball, I like to hit it a little above center medium speed.
This creates "tracks" of where the cueball will travel (the line that takes you to the first rail and the line that takes you to the object ball off the rail. If a ball is sitting anywhere on that line (track), you would hit it. If it is off the line slightly, simply adjust your aim point half the distance the object ball is away from the line.
With this said, when banking you are always going to a pocket. You can figure the right diamond to diamond connection I just described above to bank the ball to a particular pocket, and from the angle into the rail (similar to the cueball position) view a point on the wall, chair, table or whatever is out there about a table length away, and make a note of it. For many of the banks to that same pocket you can simply aim the object ball to that spot on the wall each time without recalculating.
I hope this makes sense, but there are many systems for banking, but these two seem to bee the easiest for me. You need to be able to divide by two and remember the spot you select. Good luck.
Dave