Layers on the right of the dialog box, the Slab layers dialog box appears.If you click on Layers on the right of the dialog box, the Slab layers dialog box appears.
With this option, you can create multilayered slabs (15 layers maximum). You can select such slab structures from the pre-defined sets or you can create your own slab layer by layer. It is worth creating and saving your most often-used slab structures. You can display nodal points on cross sectional drawing with the elaborateness of a construction drawing. To achieve this, you should use layered walls.
Insert new button
You can add new layers to the slab with the Insert new button. The new layer added will always be topped onto the previous layer and will have the properties of that layer.
Other layers remain intact. Layer 1 is the bottom-most one.
Delete button
Use the Delete buttonto delete any selected layer. Layers above the deleted one will shift one layer down.
Displayed layer
In the list click on the layer you want to be displayed, and then click on the Displayed layer button. The Arrow will jump to the number of the desired layer, indicating that this is the displayed layer on the floor plan.
This is very useful if you want to edit slabs layer by layer, i.e. there are different layers with different geometry.
The layered slab editing commands are only valid for the displayed layer.
Layer properties
Click on the field to select the desired layer. Double-click this field to modify layer name, material and width.
If the layer width is negative, the layer should be measured downwards, and if layer width is positive, it should be measured upwards.
The dialog box will display the 3D image of the layered slab with its total width.
Use the 
Arrow button to return to the Properties dialog box.