In the Cartesian Grid module, use the Select Grid Cells tool to select cells in flow constriction area.
Assign the cells to the "2D Flow Constrictions (cell based)" coverage by right-clicking on the selected cells and selecting the Cells to Active Coverage command.
Expand3. Assign attributes in for the flow constriction area.
In the flow constriction coverage, use the Select Feature Polygon tool to right-click on the polygons in the flow constriction area and select the Attributes command.
Assign flow constriction attributes in the Flow Constriction dialog.