Project 1: Modelling of an Architectural Design / Pre-3DS Max: AutoCAD drawing of Floor Plan (Presspull)

Before creating 3D model in 3ds Max, I firstly create the AutoCAD file of floor plan first.
I used Polyline to create them so that the lines are all connected well, as shown in the image above.
Different elements of the building are created in different layers so that I can extrude them at different dimensions/height individually.

So I had divided my building elements to:
1 Floor slab
2 Higher-level floor slab
3 Wall

I scaled the building plan in AutoCAD first.
Then, I do Extrude (Modifier List) in 3ds Max and adjust the Amount (Parameters).

Problem: When I extruded the plan, I found out that the wall is hollow with no content inside. The wall should have content filled inside.

Solution:
"Presspull" the polyline to create surface.

Import the CAD polyline into the 3ds Max.

Edit Poly > Polygon > Insert Vertex > Extrude > Type Height Value.

Content Filled.