Add a table to your PowerPoint template and add column titles to the first line. On the second line (or the first line of the body of the table) enter the names of the fields to be displayed from your report, in square brackets and prefixed with the unique reference.
e.g.
Enter the maximum number of records to be displayed by entering the corresponding number of table rows. Any empty table rows will be removed when the report is generated, but if there are not enough rows to fit all the data, the additional data will not be shown.