Slice Tool
DrawIt Pro has the ability to slice your image in several parts and each image can then be exported under its own name. Choose 'Export Slices' from the File-menu and you'll notice a blue bar slides up from the bottom of the screen.
You can add new slices by clicking on 'new slice'. You can define as many slices as you like and you can give each slice its own name. When you finally export the images, this is the name they'll get.
Note, slices will be saved between sessions because they are saved in your document. When you've defined enough slices, you can either click the 'Export...'-button to export the images or click 'Return to Document' to return to your document.