In this lesson, I create a custom object and a source report for a Reporting Snapshot. I then schedule the Reporting Snapshot to run.
In this lesson I walk through creating a Historical Trend Report.
Resource:
Historical Trend Reporting Help Article - https://help.salesforce.com/articleView?id=reports_historical_concepts.htm&type=5
Resources:
Use Summary Formulas in Your Reports (Trailhead) - https://trailhead.salesforce.com/en/content/learn/projects/create-reports-and-dashboards-for-sales-and-marketing-managers/use-summary-formulas-in-your-reports
Custom Summary Formulas
https://help.salesforce.com/articleView?id=reports...