1. Open GemPro and click on the Open Portfolio File icon.  
2. Select the relevant security on the Portfolio Grid.
3. Delete the selected security by clicking the Delete icon    and then click Delete Security to show the Delete Security screen.  Click the Delete It button to confirm the deletion.
4. Collect your daily data as normal.  This will recreate a new data file for the deleted security with one days of information. (If you have already collected your data you can use the Utilities/Distribute Daily Data menu command to re-distribute a previous days of data).
5. Select the newly created Code on the Portfolio grid.
6. Click the Refresh History Icon   to restore the history for the selected security via the Internet.