Hello @Synconics,

We have a separate forum wherein you can start a discussion about API integration. Someone from there can explain better what you're supposed to follow when creating a new type of product in QuickBooks Sandbox.

To do so, you can click on the link I'll be including below and enter your question after clicking the Ask a Question button.

https://help.developer.intuit.com/s/topic/0TOG00000004r45OAA/india

Lastly, I've got you this helpful article in case you need to create a group of your products in your regular QuickBooks: Group your products and services into different categories.

Stay safe and give us a comment or post again if you have any other questions.