Each item has a comprehensive item card, including relevant information like Name, Category, Variants, Variant codes / SKU, Sales price, Purchase price, Default supplier, Product Recipe, and Production Operations.
Items can be used on Sales Orders, Manufacturing Orders, and Purchase Orders.
Items can be accessed by opening the Items screen from the header.
After opening the Items screen, you can see tabs at the top of the table which let you choose whether you wish to access your Products or Materials.
In Katana, subassemblies are products, not materials. So, subassemblies are included in the Products tab.