Here’s a simple example that extrudes the polygons in a grid, and then applies a second extrude op to the extruded polygons.
I modified the Disconnect compound to output the Topo, just to make it easter to connect things. Really, I should probably daisy-chain everything in this example.
Chris_TC did something more sophisticated here.
For the absolute beginner/uninitiated it might be an idea to add a screenshot from your alteration of the “Disconnect” compound also.
And completely OT: you really should consider to add this blog to your forum signatures