Asset register
Every asset on its own record, with what depends on what.
Every property, machine and vehicle you look after has its own record, its own label, and its links to the assets it depends on. When one fails, you can see what else is affected.

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A label on each asset opens its record
Print the QR label from the app and stick it on. Scanning it opens that asset: its history, documents and open work. To report a fault, no account is needed.
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Record what depends on what
The boiler is in the plant room, the plant room serves floors three to six, the hoist rides on the van. Pick an asset and see how far a failure there reaches.
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Sites, and the people who look after them
Assets belong to a site; a site belongs to a team. Give a site to a team and everything in it follows, with a map alongside the list.
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Bring in the list you already have
Import a spreadsheet; each row becomes an asset. The app suggests which column is which and points out likely duplicates before they are created.
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See what is missing on each record
Each asset shows how complete its record is and what filling in a field unlocks, so the weak records are visible before someone asks about them.