Is this possible to enter or manage for internal or self-use in the company? Right now I am creating Sales Invoices and Purchase Invoices to manage Inventory stock. But how can I enter inventory consumption(s) for company’s internal or self-use?
For inventory consumption, you can use production order to manage inventory consumption to produce a finished inventory item. I trust this is what you are looking for?
If not for production, use an inventory write-off. Post to a suitable expense account based on what you are using the item for. See https://www.manager.io/guides/10709.