A dynamic summary section on your form pulls relevant fields that have been answered and places them into a Summary at the start of your report.

To add a field to the dynamic summary, open the Edit dialog and tick the following checkbox:

Fields are added to the summary in the same order that they appear in on the form.

To view all the fields which have been added to the summary, click on the Summary tab in the navigator

Then, when a PDF is generated, a summary section will automatically appear at the beginning of the report with any of the relevant fields.