Show Components from the Item card lets you pull up components for any built item.
In the Items search showing the components you can then +Add columns for Landed. This lets you see which items have a Landed Cost % assigned, in this case, a Decanter.
Glass Decanter is assigned a 10% Landed Cost percentage that is applied to its Landed Cost when changed, and to Landed Cost of all items built from it when its does change.