hi jameze here is your answer below,
How are you? Hope you are fine and enjoying learning 3ds max.
Here I am concerning about your problem in 3ds max, you asked me the Boolean is not working? Or you can’t fix the hole for window or something like that?
Listen I am here giving you a little tip below,
1-before making any hole in any object first create what you going to put in the hole.
2-always create the object first you want to place in the hole and then create a hole or something what ever you are going to do.
3-when you create the object put it in any place you want to create a hole according to your object size this is I think perfect way without a lot inconvenience.
Now I will tell you how to do Boolean? There tow kind creating hole as below,
First we are you going to how to create a hole in object such as for window, ok now what we have to do?
Create a box in front view port the thickness is not important any thickness will serve, now for window what way will be the best to create a easy window in a seconds ok don’t be panic it’s not a big deal, go to create tab from dropdown menu click door from the door modify panel click BiFold and drag with your courser in perspective view port, you confused that why I here don’t chose the window from dropdown menu the aim is this BIFOLD door will serve as much as real as like window not door play with settings to have shape like window.
Now create a box in your front view port again to create a hole for window measure it as measurement same the window size you have created, when you fix it to the box do the Boolean operation, go to create tab again from drop down menu select COMPOUND OBJECTS before going to Boolean make sure the wall is selected with the wall selected click Boolean again make sure SUBTRACTION (A-B) selected now click the button PICK OPERAND B and click on the small box you created to make hole and you will see the hole appears, now fix the window and you will have nice Boolean hole in the object, here I am giving you a simple picture which I did when I was wetting to your question.
2- Spline operation
Its easy then Boolean operation ok lets start how to create it,
Go to create tab from there chose SHAPES the shapes rollout will appears from the rollout chose rectangle and create a rectangle shape in front view port now once more create a rectangle shape again but this time the rectangle should be smaller as like the hole for window because we are going to create a hole for window here, when you did this right click in any one of rectangles and from pop-up transform chose CONVERT TO
And then CONVERT TO EDITABLE SPLINE now the spline modifier appears from the modifier scroll down and find ATTACH select the attach button and then select the rectangle which is selected now your tow rectangles will be one object now you are pretty done.
Here we are going to EXTRUDE our shape, go to modify panel from dropdown menu select EXTRUDE here you give any amount for extrusion of your wall and then fix your window and enjoy.
These were 2 way of how to create hole for window with Boolean and splines.
Hope I helped you and enjoy your modeling.
Thanks Aziz Khan