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So,

Do you guys use sub bass as part of each particular sound you make (for example one of three oscillators would be a sub bass), or do you have just one track for sub bass and modulate it in accordance with the rest of the bassline?

Separate sub bass.

Separate, all the way. No point in trying to match volumes and signal-splitting every single sound when a sub is always a sub anyway. There is one exception for me though, that's when I modulate the pitch on a sound, like a growl. Then I'll clone the patch and then replace one of the with a pure sub, and then link both pitches to the same automation so the sub has the same movement as the other sound.

personally what i do is i find a bass sample or something that could be used as a bass sample (lots of low end). i make sure it is playing a long note (about 8 seconds long), then i use a free plugin called engineers filter to sharply remove all frequency's in the sub domain, then i break out massive to add a single sine wave with no effects / processing to layer under the sample.

once i have the original sample with the sub cut out, and my own added sub bass ill bounce that down and chuck in a sampler to play like an instrument. this is what i did with the track in my sig and i think it sounds alright. but of course it depends on what your going for