Can someone please advise how to get them back for re-listing? Thanks.

We have been buying and selling on trade me for years. We do multiple listings. When we go away for a week or two, we can easily relist when we get back. Soon we have to go away for about 3 months. We multiple listings with photos, descriptions, etc. How can we relist the unsold items without having to start all over again? Any ideas please?