To create a scene that only updates some parameters in your project, tap on the scene's name label and select "Parameters". Tap on the individual parameters in the view that appears to toggle whether to include them in this scene or not.

Parameters not included in a scene will remain at their current state, which includes intensities, colors, positions, FX options and more.

Note that parameters designated as a Master are completely unlinked from all scenes, so these parameters can't be included (designated by a ★).