If you want to find all invoices which contain some inventory item, you can get ledger for inventory item which will show all invoices related to that item. Is this what you are after? Or something more?
Yes, indeed something like that. How can I consult the ledger for finding the mentioned inventory items of purchase orders and invoices? For an user it should be handy if you can do this from the search field. I added an video in attachment, see link https://forum.manager.io/uploads/short-url/bPseAPkf5kw8Hm393sWgVTxqDIy
You can go to Inventory Items tab, find the inventory item and click on Qty figure. This will give you full ledger for that specific inventory item. It will list all transactions (e.g. invoices) which have used that inventory item.