To export formats from the Preview view within the Report Designer (on the Formats tab)
Select the Format you want to preview from the tree list in the Explorer pane.
Click the Preview button,
on the Format Editor window toolbar. The Format Editor window changes to the Preview view, displaying the selected Format.
Click the Export button,
from the toolbar. The Select Export File window opens.
Select the folder in which you want the exported file to Save in.
Enter the File name of the export file.
Select the Save as type format you want to export the report to.
Click OK to begin the export.