Visit the project in which you want to edit levels and sectors and do the following:
Click on settings to the left in the project view
Click Levels and sectors after you clicked on settings
Click add sector to add new sector
What is levels and sectors?
You can divide larger projects into different levels and sectors. This helps the person that is reporting the deviations to show the person responsible to resolve the deviation where the deviation exists. Examples of levels are: plan X, floor X, etc and examples of sectors are: Area X, Staircase X, Zone X, etc.