Activity areas can be divided by using the Divide radial menu item. This feature works best when top down camera view is selected.
Select the Divide icon to enable and display a + cursor.
Move the cursor to the highest point of the topographical surface near the activity area to divide (this ensures the divide line preview is not hidden by the topographical surface).
Click once to start the divide line, move the cursor to the end point or any intermediate points of the divide line, then click again. To complete the divide line click twice. The activity area is divided by a vertical plane.
The divided portion that contains the start of the non-divided area mining direction is named_3 digit number_001. Any new portions are named sequentially by appending an underscore and 3 digit number to ensure a unique name for the divided areas.