You can copy an entity in a rectangular pattern, creating an 'Array'. For a rectangular array, you control the number of copies in the array by specifying the number of rows and columns. To make arrays of entity do the following steps.
Enter the number in row and column so that desired number of Entity will create in array. You can specify the spacing between entities by entering values in 'Vertical Spacing' and 'Horizontal Spacing' edit box. Otherwise all entities will be overlapped. The array dialog box initially shows default values for both 'Horizontal Spacing' and Vertical Spacing' which are the value of bounding box for draw entity.