Focus your Campaign Activity Report on specific smart campaigns.

Go to Marketing Activities (or Analytics) and select your campaign activity report.
Click the Setup tab and double-click Campaigns.

Choose the folders and specific smart campaigns to include in your report. Click Apply

 

If you select a folder, your report will include everything that folder contains at the time the report runs. 

 

You're done! Click the Report tab to see just the selected smart campaigns in your report.

Learn all about reports in Basic Reporting.