To edit the block associated with a symbol

1. In the Project Setup tree view, expand P&ID Class Definitions.
2. Continue to expand the list until you locate and click the component whose symbol you want to edit.
   
3. On the Class Settings pane, under Symbol, in the drop-down list, click the symbol that contains the block that you want to edit.
4. Under Symbol, click Edit Block.
5. In the Block Editor, edit the geometry for the block as needed.
6. Click Close Block Editor.
7. Click OK.