code: async def create(
              cls, boot_source, os, release, *,
              arches=None, subarches=None, labels=None):
          
          if not isinstance(boot_source, BootSource):
              raise TypeError(
                  "boot_source must be a BootSource, not %s"
                  % type(boot_source).__name__)
          if arches is None:
              arches = ['*']
          if subarches is None:
              subarches = ['*']
          if labels is None:
              labels = ['*']
          data = await cls._handler.create(
              boot_source_id=boot_source.id,
              os=os, release=release, arches=arches, subarches=subarches,
              labels=labels)
          return cls._object(data, {"boot_source_id": boot_source.id})
docs: Create a new `BootSourceSelection`.