An object is grabbed by pressing the left mouse button while the mouse is on the object or moving the mouse to the object while the left mouse button is down and no other object is currently grabbed. To grab two or more objects at the same time, the mouse should be brought to a point where the objects are very close to each other (or meet) and grabbing at that point.Grabbing one object can lead to several objects being grabbed at the same time, depending on where they touch. For example, if four lines are connected at their ends such that they form a square, and one of the lines is grabbed at its middle, moving the mouse will cause that line to move, and the connected lines to follow its ends, thus preserving the relationship between the lines.
Multiple objects can be grabbed very easily while in edit mode if the mouse has a middle button. They can be grouped, grabbed then ungroup (see grouping)