var circle1 = new fabric.Circle({
  radius: 50,
  fill: 'red',
  left: 0
});

var circle2 = new fabric.Circle({
  radius: 50,
  fill: 'green',
  left: 100
});

var circle3 = new fabric.Circle({
  raduis: 50,
  fill: 'blue',
  left: 200
});

var group = new fabric.Group([ circle1, circle2, circle3], {
  left: 200,
  top: 100
});

canvas.add(group);