Hi ArunAngusamy27 ,
You can use soap tag of gel script, i have placed template as below:
<soap:invoke endpoint="${externalURL}" var="result">
<soap:message>
<soapenv:Envelope>
<soapenv:Header>
</soapenv:Header>
<soapenv:Body>
</soapenv:Body>
</soapenv:Envelope>
</soap:message>
</soap:invoke>