Nick,
These are just Layers built off the Parcel Fabric sub-layers, at 10.0 these were made editable by the parcel editor if they share the same source.
To create these, just right click a Parcel Fabric sub-class and choose to 'Save as Layer File'. Make sure that the feature template is setting the value in the definition query if you use one on the layer. If you need a reference, use the Organize Feature Template tool on the Tax Parcel Editing Map document to see how it's set up.
Thanks
Chris