Revit Architecture
Revit MEP
There are various ways to modify schedules to improve the readability and to keep them up to date with changes in your project.
Schedule Updates
All schedules update automatically when you modify the project. For example, if you move a wall, the square footage updates in a room schedule accordingly.
When you change the properties of building components in the project, the associated schedule updates automatically.

For example, you could select a door in the project and change its manufacturer property. The door schedule would reflect the change to the manufacturer property.