Dravyanuyog is the branch of Anuyoga that deals with dravya (substances) and the tattvas (principles) that underlie them. Its sub-parts, in traditional Jain texts, focus on the six dravyas (eternal substances) and the nine tattvas that describe reality. In practice, this Anuyoga covers:

• The six dravyas: Jiva (soul), Pudgala (matter), Dharma (medium of motion), Adharma (medium of rest), Akasha (space), and Kala (time).
• The nine tattvas (fundamental truths) that explain how these dravyas interact and bind karma.

Within Dravyanuyog, the sutras and contents often discussed include works like Jivabhigam Sutra and Uvavai Sutra, which treat the nature of Jiva and related topics, as part of this Dravyanuyog corpus. There can be variations between Digambar and Shwetambar traditions in emphasis, but the core Dravyanuyog material centers on the six substances and the nine tattvas. You can read more here