Deleting Global Variables
You can delete global variable definitions from Integration Server using Integration Server Administrator. If you delete a global variable that is used by a flow service, while executing the flow service, Integration Server will throw an exception and stop the service execution.
To delete a global variable
1. Open Integration Server Administrator.
2. In the Navigation panel, select Settings > Global Variables.
3. Locate the row that contains the key/value pair that you want to delete, and click the 
icon. Integration Server prompts you to confirm that you want to delete the global variable.
4. Click OK.