Hi Laura,
You say that the information is divided into layers. Typically you would style these in the Layer Control and then save a Worspace, then they will have the same rendering next time you open your workspace. This works fine also if the data has been edited, as long as the layers in the Geopackage are the same.
Sometimes you want to style your data based on some category that is available in an attribute. I know that our Swedish partner Geografiteknik developed a tool for creating templates to style external data - be it from Shape, Autodesk, Geopackage or other sources - so that the styling could be re-applied on the coming deliveries. I am happy to give you contact details if this is your use case.