Under general classification principles, a machine presented with auxiliary components that are clearly designed to work together as a functional unit is typically classified as a whole according to the primary machine's function. However, if auxiliary systems are shipped separately or invoiced independently, each component may need to be classified on its own merits. Importers should consult a licensed customs broker when the primary-versus-auxiliary boundary is unclear, particularly for automated handling systems that could also be classified under general industrial automation headings.

Automated doffing systems designed specifically for use with textile spinning or winding machines are generally classified as auxiliary textile machinery because their design and function are specific to the textile production context. General-purpose industrial robots that happen to be used for doffing would more likely fall under robotics or general machinery headings. The degree of textile-specific design — such as spindle-pitch compatibility or yarn-package handling geometry — is the key factor in making this determination.