How to apply for changing the top floor of a house into a flat slope?

To add a storey to an old house, you must first submit an application report to the housing management department for approval and seal, then fill in the project application form and seal it in the National Development and Reform Commission, then go to the planning department for approval of planning permission (with drawings attached), then go to the construction management department for approval of construction permission, and finally go to the urban management for filing, so that construction can start. Hope to adopt!