In order to modify or apply CAD operations to objects, they must first be selected. The navigation tree provides a convenient interface that allows you to select one or more objects. The simplest way to select an object is to click on its surface in the project workspace. When an object is selected, its color changes to the "Selection Color" (yellow by default). When you select an object in the project workspace, its name on the navigation tree is highlighted in the selection color. Alternatively, you can select an object by clicking on its name in the navigation tree. In that case, the selected object's name is highlighted in the navigation tree, and the object itself is highlighted in the selection color in the project workspace. To deselect a selected object, simply click on any blank point in the project workspace.
You can select more than one object at a time. There are several ways to do a multiple selection. The simplest way is to select the first object in the project workspace. Then, while holding the keyboard's {{key|Ctrl}} key down, click on the second and subsequent objects that you want to add to the selection. You can follow the same procedure in the navigation tree. While holding the keyboard's {{key|Ctrl}} key down, click on the names of all the objects you want to select in the navigation tree. In a "Range Selection", you can select a sequential set of objects belonging to the same color group. First, you click on the name of the first object in the navigation tree. Then, while holding the keyboard's {{key|Shift}} key down, you click on the name of the last object to be selected. All the objects whose name names are listed between those two objects are also selected and highlighted.
Cut, copy, paste and delete are some of the most common edit operations. As in many other Windows applications, you can cut an object (from the workspace) and hold it in the Windows' clipboard until you paste it back to the workspace. You can also copy an object and paste it back to the workspace. Deleting an object removes it forever from the project workspace, although you can undo your delete operation.