You can import layer states that are saved in drawing files (DWG, DWS, and DWT) or directly in a layer state (LAS) file.
If the layer state is imported from a drawing that contains layers not present in the current drawing, these layers are imported into the current drawing.
If the layer state is imported from a drawing and it contains a layer property, such as a linetype or plot style that is not loaded or available in the current drawing, that property is automatically imported from the source drawing.
If the layer state is imported from a LAS file, and it contains linetype or plot style properties that do not exist in the current drawing, that property cannot be restored.
When importing a layer state that is a duplicate of a layer state in the current drawing, you can choose to overwrite the existing layer state or not import it.