Clearing Condition Values or Assignment Result Values
You can clear the operators and values that you entered for a condition link or assignment result node.
To clear a value:
2. Select the condition link or assignment result node that you want to clear. Hold down SHIFT or CTRL to select multiple links or nodes.
3. Do one of the following:
a. Right-click and select 
Clear from the context menu. b. Click in the toolbar. c. Press DEL.