Go to the piano roll editor, click on the 3 bar icon
Click on the down arrow next to the number scale, and all your midi controls will show.
you can automate all of them, so click on Pitch Bend or whatever its called and you can automate the pitchbend within the MIDI region. Make sure that the nodes at the two extremes are inside the area of the region or else the pitch bend automation will be sustained for all the concurrent MIDI.
Here's what I do for ease of use... I play a bass riff or whatever and use the pitch wheel and record it in my DAW (studio one). Then if I need to repeat this on another instrument I'll copy that midi data to the additional VST or my synth midi track and use a different sound. That way I can keep the pitch wheel part exactly the same for different sounds, parts, sub etc.
As long as all the layers of the sound are pitchbending with the identical node settings and the start/end points are zeroed out, your bass will always stay in tune. Also, it helps to have the peak of the pitch be something harmonically relevant to the key. I typically will set the synth max bend (up) to +2, +3, +5 etc. so that the peak will still be in key with the tune as a whole.