Modify only a section of a clip but export the whole clip?

i think the answer is no, but just wanted to confirm. can i make changes to the 2nd half of a video clip but export the entire video as one export?

You will need to use the in and out points to render out the part of the video you want to apply the filters to, then stitch the video back together in an editing app such as Premiere or Davinci for example.