Hi Matt,

There are a lot of ways to copy one layer to another drawing, for example:

- use Saveas command to save existing drawing with new name, turn off layer you want to leave in the drawing, erase everything visible, turn on the layer you want to leave, use PURGE command to purge all empty layers. You can also dragg off the empty layers from the Layers Palette to remove them from drawing.
Or
- use Quick Select command to select everything on the layer you need, copy to clipboard selected objects, create new drawing and use paste to original coordinates in it (if you are using AutoCAD 2017), or just Paste in older versions.

Maxim