Naturally, Blender is capable of selecting more than one object at a time. Blender has many tools to help when selecting objects. With multiple objects, the transformation commands work on all the selected objects at once. This is a powerful way of controlling transformations while keeping objects in relative positions to each other.
One way to select multiple objects at once is to hold down the Shift key while clicking on the desired objects one at a time. To deselect an object, it must first be made active. The active object is highlighted in a different color. Then it can be clicked again while holding the Shift key, and it will be removed from the selection.
Another way to easily select multiple objects in a scene is to use the border select command and draw a box around the objects you want to select. To border select, choose Select | Border Select from the 3D View menu or press B on your keyboard. Then, click and hold down the select mouse button, move the mouse pointer, and release the mouse button:
If even a small part of an object is included in the box, it will be added to the selection.
To deselect objects with border select, use the middle mouse button when drawing the box.
Circle select is another powerful tool for selecting multiple objects. To circle select, choose Select | Circle Select from the 3D View menu or press C on the keyboard. A circle will appear around the mouse pointer. Use the scroll wheel or + and – on the Numpad to increase or decrease the size of the circle. Then, click or click and hold the select mouse button, and everything inside the circle will be selected. Use the middle mouse button to deselect:
Circle select only adds or removes an object from the selection if its center or origin is inside the circle when selecting.