Welcome to the Bunnings Workshop community @Wallace. Thank you so much for joining us and sharing your question about how to build a split-level deck near your fence.
In order to help our members have a better idea of your split level deck, would it be possible for you to post a photo of the proposed decking area? Once our members see it, they can then make a comprehensive recommendation of how it could possibly be laid out.
Please keep us updated, we look forward to seeing the photos.