Say it in your words.
Describe your company like you'd brief a new hire. Customers, plans, tickets, renewals, and how they hang together. That is your ontology, and Amazity builds on it rather than bending you to a template. Your entities, your relations, your rules. No field called "custom 1".
"We sell seats on annual plans. A customer signs up, someone runs onboarding, tickets come in, and every plan has a renewal date. Maya approves any discount over 20%."
becomes your ontology