To Redefine a Symbol
1. Click Format > Symbol Gallery. The DEFINITION menu appears.
2. Click Redefine. The GET SYMBOL menu appears. Use the Diagram Item or Symbol filters to select the required symbol.
3. Select an instance of the symbol to edit or click Name to select a predefined symbol from the Select Symbol Definitions dialog box and click OK. The symbol is placed in the drawing.
4. Use the SYMBOL EDIT menu to make the edits.
If you edit the drawn symbol, all instances are updated. If you edit symbol parameters, you can check the Propagate option to globally update the symbol instances in the design.
5. Click Done/Return, when you finish.