So you want to copy part of the columns and add it to a new image then create a new original background or you want to keep the original background?
I think you see managed to copy the column from what I see above. But what do you want to do exactly. As I am unclear on the background part...
If you want to create a new background.... then create a new layer and place it under the column.
If you want to original background then keep that layer under the copied coloumns.
We need more info to clearly understand what you want to achieve.