To copy and paste rows, columns and stitches using Copy Dragging;-
Select the items to be copied. Selected items should be of the same type, for example only rows or only columns or only stitches but not a mixture of these.
Hold down the Control (Windows) or Alt (macOS) key.
Click down on any of the selected items and then, whilst the button is still down, move the mouse to drag a copy of the selected items.
Release the mouse button to finish dragging and invoke the paste.
Alternative sources of explanation: