There may be cases in which some areas within the farm are not intended for agricultural activity (E.g.: natural reserves, transmission towers and so on). In this case, it is possible to make 'crops' within the designed area to delete them. Follow the next steps to crop the areas: 

1- Delimitate the area as mentioned in item Creating Area till step 12 previously mentioned;
2- With the drawing tool  still  selected, hold 'Ctrl' and click with the mouse in the area you want to crop;
3- After finishing the area delimitation, double click with the mouse to conclude it. The area with agricultural activity will become orange while the cropped area will get the map background color.
4- Click on . The created area will be tied to the selected farm and will be available for use.