Survey List Tools. To help you manipulate the Survey List, particularly for larger caves, the program provides a set of special tools. Among other things the tools allow you to set large blocks of survey using the highlight.
Highlighting. A Survey or a Section can be highlighted by clicking on it. You can highlight a range of items by clicking on item and then holding down the Shift and clicking on another item. This will highlight all the intervening items.
You can also hold down the Control Key and high light individual items by clicking on them. As long as the Control Key down, all the previously highlighted items will remain highlighted.
Here is a list description of each tool: