I need help with windows and doors

[Numero8]

Hi guys,
i'm new in this site, i always loved mafia the city of Lost Heaven and in the last time i started to modding that by traslate russian tutorials.

Today i need a help to learning how create "holes" in the building (
as in the following picture ).







Image without holes --> http://oi68.tinypic.com/x0txdf.jpg
Image with holes --> http://oi64.tinypic.com/352g1mf.jpg

Can you help me to create holes in the building?
What kind of software should i use?

I'm a simple "modder" i use Mafia World Editor and BScriptView to insert script or characters.

Sorry for my bad english but i'm from Italy

THANKS FOR YOUR HELP

[T3mas1]

Use my model instead: http://www.mediafire.com/file/1i3ft3n83c46zlz/PRO_ITALA_Z_FORUMA.rar

if you are gonna do this thing again, you should learn to work with Zmodeler 1.07b, there you take a model and edit its corners/edges, if the model has enough polygons otherwise you'll need to use the brake feature.

[Numero8]

[T3mas1]

My spelling is bad. sorry, I meant break not brake. By the break feature I meant breaking the model into more polygons in one place.