Hello Warren,
You don't need to publish the part file with your properties in order to have the required properties in that file when you place it from CC.
After you copy the family into your R/W library, open family table and via Column Properties map required columns to required properties. If the family does not contain a value that you would like to see as a property, add a new column and fill values for each member (part size) and then map to the property. If you want to have the value in a custom property, in the Column Properties dialog select mapping to Custom and enter a name of the custom property. When the part is being placed from CC, the custom property is created.
Regards,
Mila