The layer specification can be edited using the "Edit Layer Specification" method from the "Layer" submenu inside the "Edit" menu. A dialog is shown in which the layer, datatype and (OASIS) name of the layer currently selected in the layer panel can be edited. On save, the shapes are then mapped to the new layer.
A layer can be cleared (either cellwise, on a cell's hierarchy or for all cells) using the "Clear Layer" method from the "Layer" submenu inside the "Edit" menu.
Layers can be copied (duplicated) using "Copy Layer" from the "Layer" submenu inside the "Edit" menu and deleted completely using "Delete Layer".