The report list shows the reports for surveys to which the user has access. It includes public reports and reports for which the user has analyst privileges for all the surveys for the report.
When copying a report, the surveys in the copy that correspond to the surveys is original report can be specified. This function allows creating a copy of a report to surveys related but not identical to the surveys in the report being copied. When the surveys for the copy are different from the surveys in the report being copied, questions are related first by page and then by short name or by page and full name if the short name is not available. Scores are related through their system assigned keys. A conversion log is available in the report options screen of the report copy that identifies any issue encountered while creating the copy of the report.
See also How to work with tables