I've made a few presets for tracks and busses. I'd like to be able to add or delete a preset to/from multiple tracks or busses. Is it possible? Thanks

Do you mean loading a preset into a plugin? (on multiple tracks)
 
I have no idea if it will work, but your best bet is to try selecting the tracks and hold down "ctrl" while you add the preset. Otherwise, you could load the preset on one track, then ctrl drag the FX to the others (one at a time)
 
Sorry if this doesn't help - I'm just trying to think of things... 

If I understand the question correctly (same way as jbraner), that is,  you'd like to control the presets of several plugins or plugin instances simultaneously, I'd be very, very surprised to hear that there's a way to do it. It would be cool, even though I don't think I'd ever need the feature.

I'm talking about simply loading them into the bin. If I have 24 tracks I want to load with the same chain preset, it would be great to be able to do them all at once.

Hi. You can insert multiple Pro Channel presets while holding Ctrl when loading. Just save Pro Channel (with fx chain if needed), and insert on selected tracks.
All the best.

None involve Pro Channel. I will try to see if the ctrl move works for me - Thanks!

Sorry to say, but no. 4 tracks selected, only 1 instance loaded.  It may be out of reach at this juncture." />

But it is doable in the Pro Channel, by using presets. I cannot do it with Vst's.
All the best.

Save the fx you want to use in an fx chain in the Pro Channel. Save Pro Channel. Ctrl when opening preset (you saved) on multiple selected tracks.