I'm trying to add fixed assets via the FAM, but the original cost and depreciation amounts are not transferring to the associated accounts.

Hello, @Sam-Marhoon. The Fixed Asset Manager (FAM) acts as a tracking and scheduling tool, but it does not automatically record the initial acquisition cost or historical depreciation in your General Ledger.

To ensure you'll have a record of the depreciation amounts under the associated accounts, you must record the acquisition separately via an Expense, Check, or Journal Entry, ensuring you select the same Fixed Asset account you mapped in the FAM. 

I highly recommend consulting your accountant about this. They can provide tailored guidance based on your business setup and situation.

For further information about managing fixed assets, visit this article: Add and manage fixed assets in QuickBooks Online Advanced.

Should you have any other concerns, feel free to reply to this thread.