Duplicate a rectangular or irregular shaped areas of a sketch or an entire layer.
Copying a rectangular
area
The cursor changes to a cross with an arrow.

Lifting the stylus selects the area.
Copying a lasso area
The cursor changes to a lasso.

Lifting the stylus selects the area.
To copy the merged contents
from all layers, select Edit > Copy merged
.
Copying and pasting
the current layer(Otherwise, the layer pastes onto itself.)