Getting a specific section of an image and blitting it

Hello, I'm writing a map editor for a game that me and my friend are coding, and I can't seem to figure out how to get a 32x32 section of an image, and blit it onto a tile in the editor. I also cannot figure out how to load the image into a GroupBox using an OpenFileDialog.

What I really need to know is the following:

Getting any 32x32 section of an image (by coordinates of the image) and blitting it into a pictureBox on the map editor, and loading the original 320x320 bitmap into a groupBox for the tiles.

Any help is appreciated.

[564 byte] By [Tilex] at [2007-12-23]