The next sentence ending in ‘bring forward twice' is ambiguous
I was referring to the polygon created by clicking on the outline of the part, I should have added, but not the circles, bring that forward twice. This polygon is behind the other two polygons and to be seen it must be brought forward.
In your last reply, you talked about using cut & paste:
By copying and pasting
Just select the six polygons and hold down the Option key to copy, click on and drag them down to the next part, they will snap into place. Release the Option key then hold it down again then grab and drag again.
I am wondering if I need a better understanding of the various arrange options (or possibly show and hide). I am conscious I do not know when it is appropriate to ‘bring forward’ as opposed to ‘bring to front’, for example.
Try making four smart polygons, color each of them different and then tile them over each other. Use the arrange option to move them forward and backward. The "Bring to front" and "Send To Back" just move the selected polygon all the way to the front or all the way to the back with just one click. Circles behave a little different. Take a circle and fill it. You now have a circle and a filled polygon. The polygon cannot be moved by itself but select the circle and move that, the polygon will follow. The circle can also be deleted and the polygon will now move as expected. You will experience this same issue with smart polygons created by the fill tool if the underlying geometry is single line objects.
Consider making the parts in some unused portion of the drawing and when complete copy/drag it into place in the drawing.