The Repeat and Duplicate tool takes the current selection and copies it to the current layer a specified number of times in a specified direction.
Repeat and Duplicate
The Repeats input box specifies the number of times that the contents of the selection should be pasted into the active layer.
Xoffset sets the horizontal positioning in pixels of the copied contents. Negative values copy the selection contents to the left.
Yoffset sets the vertical positioning in pixels of the copied contents. Negative values copy the selection contents above the original selection.