Report Builder Window
Before you can begin working in Report Builder, you must do one of the following:
To create a new report, click New. The Getting Started pane is displayed. Select the report server or SharePoint library where your data source is stored, the source of data that you want to use for your report, a report layout, and then click OK. After you have selected a data source, the Report Builder window opens completely and you can start working on your report.
To edit a previously saved report, click Open from a site or server. The Open Report dialog box is displayed. Locate the report you want to edit, and then click Open. The Report Builder window opens and you can start editing your report.