The procedure is exactly the same in any other angle. What I probably didn't highlight enough is that when you initially point the scope to your nose and dial in the target's AOB at that bearing(ie. 90 left or right), you're not really pointing the scope at your nose but to a bearing that intersects the target's track at 90 degrees. In the above case, which is the simplest one, it just happens to be on your nose.
If you're be approaching the target's track at an angle, let's say 60 degrees, you just need to use some math to calculate the bearing at which your line of sight intersects the target's track at 90 degrees, turn your scope to that bearing and then continue setting up the TDC as before.
Example:
Our course is 250, target's course is 315
Bearing we need to point our scope at =
Target's course - 90 degrees - Our course = 315 - 90 - 250 = -25
-25 + 360 = 335
So we'd need to point our scope to bearing 335, then set-up the TDC. The explanation might not open up immediately, but if you draw it out or play it ingame, something which I can't do at the moment, it becomes clearer. Note that you need to use +90 degrees if target is coming from the right, and -90 if it's coming from the left.
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