Follow the steps below in order to use web service object in Manual view:
Open a test case in Manual view, then select the option to add a Web Service Keyword from command toolbar.
A Web Service step is added to the test case. To send a request to Web Service, you need to use Send Request keyword. Select the Send Request keyword now.
Double click on object cell to specify the web service object to Send Request.
Variables for Web Service Test Object
When you modify the variables of a Web Service Test Object in a test case, the values will ONLY apply to that particular test case. If you reuse that Test Object in another test case, Katalon Studio will get the original values that were defined in the Test Object view
The output of Send Request keyword could be validated if needed using different Verify... keywords depending on your situation.
//Send a SOAP request and returns its response
def response = WS.sendRequest(findTestObject([the ID of Web Service object]))
//Verify if a value at a specific location in response is as expected
WS.verifyElementPropertyValue(response, <Element Locator>, <expected value>)
The following API docs may prove useful when working with web service objects: