Yes, you can create a Business Analyst Dataset (BDS) layer with any polygonal layer using the Custom Data Setup wizard in Business Analyst desktop and this link will provide more information on the wizard. If the data you wish to build the BDS layer is already in your boundary layer then all you need to do is walk through the Custom Data Setup wizard to build the BDS layer. You can use your own data or if your boundary layers are empty you can aggregate our data Append Data wizard to your boundary layer and then run it through the Custom Data Setup tool.