Disconnect the data link from Power BI Service

[tbrown33]

Is there a way to disconnect the dataset of a report downloaded from the Power BI Service so changes can be made to the report and the changes aren't able to reflect back to the original report or dataset?  '

For example:  a group of testers will be working from a report saved to a desktop, but we don't what thier work to be able to save back to Power BI service.