Seperate shape in to a new object

[FlevasGR]

Hello, im working on a 3d model and im having the following question:
If you have one solid object and you have a specific part that you want to seperate in to a new object so you can moove it and Unity3D will recognise as standalone model how do you do it?
You can check the screenshot to see the parts that i want to seperate http://prntscr.com/3fsudh
Thanks

[micheus]

With the faces selected you can use the L shortcut to select a region edge loop and then you use the command Loop Cut to separate the pieces.
Check is is this you are looking for.

[FlevasGR]

That what exactly what i wanted thank you so much! also is there any window like Blender so set the cords of an object?

[micheus]

is there any window like Blender so set the cords of an object?

Not a window, but you can use Absolute Command->Move for that. Don't forget to pay attention to the Information Line for the options available.