Access from the Manage Custom Symbol Lists dialog and click Rename. The Rename Custom Symbol List dialog is displayed.TradeStation Help
The Rename Custom Symbol List provides the flexibility in changing the name that would be most suitable for the list of symbols that it is associated with.
Access from the Manage Custom Symbol Lists dialog and click Rename. The Rename Custom Symbol List dialog is displayed.
Original Name 
Contains the current name of the selected custom symbol list.
New Name
Click OK to apply changes or Cancel to exit without changes.