Users log in to the OLISS web side and click "Maintenance→Maintenance Plan Management" in order to enter the maintenance plan management interface.Click "Add", select vessel,department information and click "Confirm" to enter the select maintenance plan interface. In this interface, click the box on the far right of the filter bar above the list to select all maintenance items on the current page,and so on. You can click "All lnvalid" or "Invalidate This Page" to batch invalid, and click "Restore-all" to batch restore. Click "Edit" "Invalid" on the right side of each maintenance item to modify/invalidate the maintenance item.Finally click "Submit".