From the Manual:
To strip all automation from a Track, [Right]/[Ctrl]-click the track in Arrange view, and select Remove Track Automation from the pop-up menu. Any previously created automation lanes remain, but all written automation data on the Track is purged.
There's an entire section in the manual on Automation. To read about it, with Studio One open, hit your F1 key or go to the Help menu in the tool bar and select the first option for Studio One Manual, the index list at the top of the next page select Automation to learn more on how to use this feature.