Updating a custom field using automation and creating a report and dashboard are the two steps required to create a solution for showing the percentage of opportunities in a certain stage that were eventually closed won. A custom field is a field that can be added to an object to store additional information that is not available in the standard fields. Automation is a way of executing actions or tasks based on certain criteria or triggers, such as workflows, process builder, flows, etc. A report is a tool that displays data from one or more objects in a tabular or graphical format. A dashboard is a tool that displays data from one or more reports in a visual way, such as charts, gauges, tables, etc.
By creating a custom field on the Opportunity object that stores the stage value when the Opportunity is closed won or closed lost, and updating this field using automation whenever the stage changes, sales managers can track the original stage of each closed Opportunity. By creating a report and dashboard that show the percentage of closed won Opportunities by their original stage, sales managers can see how effective each stage is in leading to successful deals.