When saving a DWG from your Layout, if you are only getting the Layout information and no drawings, when publishing hit the Options… button and within the Save Options set the Place Drawing into: field to Single DWG/DXF File.
When you place a DWG or DXF as a Linked Drawing (from File> External Content> Place External Drawing…) you can control the visibility of its layers. Select the Embedded Drawing and go to its settings: In the Properties Panel, click on Drawing’s own Layers to switch layers on or off.
By default when your export a layout with XREFs on it those are exported seperately (since they were imported seperately) However when working in collaboration with another firm this can be detrimental as you will want each export to be complete without any external files The easiest way to do this is to choose a
You can now save multiple Layouts into a single DWG file from Publisher by ticking Merge into one DWG file.