text: Hi Jaison,
  I guess Osmand is refering to Chegutu District.
  Please check the following links.
  Boundary relation for Mashonaland West Province:
  https://www.openstreetmap.org/relation/3336978
  Chinhoyi is included with role=admin_centre.
  Boundary relation for Chegutu district:
  https://www.openstreetmap.org/relation/7857099
  Norton should have its own boundary relation (admin_level=8). But as far as i know there are no compatible sources for such boundaries of Zimbabwe.
  With your local knowledge you could draw a approximate border for Norton. It would be better then nothing.