How to organise your inventory
A useful inventory isn't exhaustive: it focuses on what has value or wears out, and takes a few minutes to update twice a year.
Prioritise what matters
There's no need to list every teaspoon: focus on furniture, appliances and equipment that's costly to replace. Consumables (everyday dishes, linen) are better tracked through the cleaning checklist.
A "condition" column, not just a quantity
Noting the condition at the time of the inventory makes it easier to tell normal wear from recent damage during a later check.
For several properties
Duplicate the template per property rather than putting everything in one file: it's simpler to keep each property's inventory up to date separately. See also the cleaning schedule for multiple properties.