The difference between needing to use Sub Assembly & Component in the Project Level.
When you bring the components in from the library they will be set as Sub-Assembly.
If you have moved any components into a Sub-Set to group them together as a new cabinet then you can leave it as Sub-Assembly and the result will be a breakdown of all of the parts from both OH Type 1 & OH Type 2 all mixed in together.
See below assembly break down in the Cutting List. (Notice how you have the 151-2105, Kitchen and OH Cabinetry Assemblies)
If you change the Sub-Set from Sub-Assembly to Content You get individual results.
If you need to have the two different cabinets grouped together in the Sub-Set for modelling only purposes but still want them to export as OH Type 1 & OH Type 2 individually then you will need to Set the Sub-Set as Component. This will
in turn give you the individual breakdown for each cabinet or library item.
See below assembly break down in the Cutting List. (Notice how you have the 151-2105, Kitchen, OH Type 1 & OH Type 2)