Expand1. Assign layers to solids. In the Project Explorer, right-click on the solid dataset and select Properties. Enter layer range values in the Properties dialog. Expand2. Convert solids to MODFLOW using boundary matching. Select Solids | Solids → MODFLOW. Select the Boundary Matching option in the Solids → MODFLOW dialog.
Select Solids | Solids → MODFLOW. Select the Grid Overlay option in the Solids → MODFLOW dialog.