Tattvartha Sutra does not give a detailed description of death rituals like funeral ceremonies, last rites, or mourning procedures.

It mainly teaches Jain philosophy such as:

• jiva and ajiva
• karma
• bondage and liberation
• souls’ rebirth after death
• the importance of right faith, right knowledge, and right conduct

On the topic of death, it does discuss the spiritual condition at the time of death and how a soul’s next birth is influenced by its karmas and state of mind. But it is not a ritual manual for post-death ceremonies.

In Jain tradition, practices related to death and remembrance are usually found more in acharya traditions, acharas, and later practical texts, not as detailed rites in Tattvartha Sutra.

If you want, I can also tell you what Jainism says about the proper attitude at the time of death.