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Referring to the toolbar picture above, when an object is converted to an editable poly, it gives you a few extra options, each one has different powers.
The first icon lets you edit the vertexes, the second is the edges. Third button lets you edit the border of an object. The fourth and fifth button is the polygon and the elements.
Each button has the extrude option, but will let you extrude the titles named.

For example, to extrude a polygon in 3D, we click the 4th icon square to access the extrude button. Once the extrude menu is opened, press the extrude button as seen below.

Then select the part of your 3D model you want to extrude and drag it in or out, the same applies to other extrude options.

3D constraints

Having a high polygon count can crash Max, Max doesn’t like a model with too many polygons, having too many polygons increases the file size and slows down the rendering time when exporting the model into a video.
Limitations on a 3D file are generally quite high, high enough to give you the box model you want, but can’t handle an insane amount.

Mesh construction – Mesh is basically the start of 3D modelling using box modelling, cubes, pyramid or spheres. These objects can be displayed in wireframe to see through them and see where the objects meet the line if an animation is being constructed.
To convert an object to wireframe mode, I have included a screen shot of how to do this.

Right click Perspective > Wireframe