You can clear all historical data stored for symbol.

To clear data for a Symbol

1. Create a chart window. See Creating a Chart Window.
2. Right-click on the newly created window and select Symbol Properties.
3. Click Lookup in the Symbol Properties window.
4. In the Symbol Lookup window select required Data Provider and select Symbol for which you want to clear historical data.

   

5. Press Clear Data button at the bottom of the Symbol Lookup window and click Yes in the clear data confirmation dialog.