Draw the slab area

Turn on Snap to Intersection () and Snap to Point ().
Double click the Slab Area tool () to edit the default properties.
In the Default Slab Area Properties dialog box:
1. Choose a Concrete Strength of 4000 psi [25 MPa for AS3600; C25/30 for BS8110 and EC2].
2. Set Thickness to 30 inches [750 mm].
3. Leave Surface Elevation as 0 and Priority as 1.
4. Click OK.
With the Slab Area tool () selected, define the four corners of the slab by snapping to the imported drawing’s slab corners.

Note: You can type "c" to close the polygon instead of entering the last point.