I have a 5 minute video that I spliced up different scenes a bunch of times. I want to add a filter to the ENTIRE video, but I seem to only be able to add it to one section of a video (where I spliced it). How do I add the filter to ALL parts of the video instead of one by one each splice?
There are several places to add filters. You must be adding them to the clips directly, and this requires adding them individually for each clip. If you instead click the plugin icon in the track header area (at the left of the screen) then any filters you add there will effect the entire track, no matter how many events you have on it. You can also add filters to the plugin chain icon over the preview window and this will add that effect to all tracks of the entire video.
You can also add the effect to the media - in the media pool, right click and select media fx.
For 5 clips - easiest for me - add a clip event to the first event, copy the event, select the other events, right click and select paste event attribute.