Extraction can be performed on any HTTP message, such as the header or response of the message using the following steps.
Property Set - Substring Retrival Method
Note: This can be performed in either the Target Editor for a given operation (e.g. "get" or any other operation listed in the given target) or in the Clip Editor at the message level within the lower panel Message Editor). Note that target-level property sets will propagate for all messages based on the given target while message-level property sets are restricted to the one message).
By default "The value of this field” is set to "Field" and "Retreived using" is set to "Substring"
Property Set - Xpath Retrival Method