> ## Documentation Index
> Fetch the complete documentation index at: https://help.lobyco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Hierarchy Reference Book

> The hierarchy reference book.

Import and read the hierarchy reference book — the canonical list of hierarchy nodes that product hierarchies are built from.

<Info>
  **Integration guide:** [Importing product and article information](/integration/other-integrations/retail-master-data/importing-product-and-article-information) — how hierarchies, reference books and products relate.
</Info>