Hello. How do I use this SDK to retrieve the Quoted_Items from a Quote and downstream the items in a Sales Order

I can see references to a constant 

INVENTORY_MODULES_ITEMS = ["invoiced_items", "quoted_items", "purchase_items", "ordered_items"]

But I cannot find how it used or any samples.

I am using the COQL RecordOperations to retrieve the Quote in the first Instance.

Very much appreciate any support as this is quite critical