Launch DSON Loader. In the finder/whatever in Windows box that opens, find your scene file wherever you saved it (possibly in in your My DAZ 3D Library). e.g, My Buildings.duf, and select it. The loader may churn for a while, but eventually your stuff will appear in Poser. At that point, you can save it in your Poser library and think about whether you want to convert the elements to Poser native format using a tool like Netherwork's Creator's Toybox.