Details: By default the application is set up to print the entire experiment but you can select a particular section by disabling the option 'Print Entire Experiment' from the 'Print to PDF' dialog.
Steps:
1. Navigate to the experiment
2. Go to 'Actions' > 'Print to PDF'
3. Remove the check from the 'Print Entire Experiment' option
4. From the list of content elements select the one you wish to print (scrolling down might be necessary)