Hi YS, 

This can already be done by utilizing Custom Fields. Please learn more here: 

Kind regards,

That's great, just what I was looking for Andrea.

Am I able to utilise that field if populating the list via the API?

e.g. can I populate email and name using the SetSubscriberList2 (I think this may be the old API?), or do I have to use the AddSubscribers and then EditSubscriber to get that name into the system and related to the email?

Many thanks

I am populating the mailing list ok but when I try to update using UpdateSubscriberField I just get:

false -4 Subscriber email address not found.

But I know all the emails are there.

Any idea why this is?

Thanks in advance