How to transfer more than one property

Hi Team,

I had a list of ad_id in a response xml.
I want to use Property transfer to pass all of the email_ids to the next test step's request: all_email_ids.
but I can only pass one of the ad_id to it but I need all of them passed and separated by commas.
Such as, I have
<SOAP:Envelope xmlns:SOAP="http://www.w3.org/2003/05/soap-envelope">
<SOAP:Body>
<m:reply xmlns:m="http://www.kijiji.com/soap">
<email_id>1</email_id>
</m:reply>
<m:reply xmlns:m="http://www.kijiji.com/soap">
<email_id>2</email_id>
</m:reply>
<m:reply xmlns:m="http://www.kijiji.com/soap">
<email_id>3</email_id>
</m:reply>
</SOAP:Body>
</SOAP:Envelope>

in the next step's request, there is a variable named all_email_ids.
I want to pass all of the above email_id to all_email_ids.
So the value of all_email_ids should be <all_email_ids>1,2,3<all_email_ids>

Can you help?

Thank you in advance!