TreeTable example

Creating a TreeTable in CUBA platform following the user documentation was so easy, great product made by CUBA team. While creating a Task treeTable was easy, I am wondering how can i visualize real-life data e.g. sales data where i have multiple tables related as follows:

Order (customer, salesperson, SalesAmount)
OrderLines (Product, quantity, amount)
Customer (Name, Country)

I want to visualize through tree table as follows:

Level 1: Salesperson
Level 2: Customer
Lebel 3: Product

Thanks in advance for any help.

Please see this answer: