If you need a section of your form to be duplicable (to allow users to add duplicable sections when completing records), you can set this feature when creating your form template.
1. Go to "Edit Form Template" from the database that holds the form, or when in a database click on "Edit Form Template".
2. Once in the form builder, add a new section, check the box saying "Duplicable", then add the Section Singular and whether you want to enforce one section minimum.
You will need to enter in at least 1 field in order for the section to become visible.
Once completed save your form and now when a user adds a record, they will be able to add duplicate sections to the form.