Mini-CAD: Array preferences
You can insert or draw your objects on a defined x and y array. Click the icon and activate the array spacing input boxes in the dialog box using the "Use array" check box.

You do not define the origin of the array with the first mouse click. The array spacing is always relative to the system origin x/y = 0/0. That is, the drawing object is always positioned at a point corresponding to a multiple of the x/y value given in the dialog box. For the example above that is x = 10, 20, 30, etc.