From the Fixed Asset Manual/Guide:

https://docs.oracle.com/cloud/latest/netsuitecs_gs/NSFAM/NSFAM.pdf

To revaluate an asset:

1.  Go to Fixed Assets > Transactions > Asset Revaluation.
2. On the Asset Revaluation page, enter values for the following fields:

• Asset ID/Name — Select the desired asset by name or ID. Selecting an asset will display the revaluation section, showing the revaluation amount details per accounting book and depreciation method.
• Accounting Books — Select the accounting book that you want to revalue.
• Write-down % — Enter the write-down percentage for revaluation. This will be applied to tax methods associated to an accounting book. For compound assets, the write-down percentage will be applied to all components. If you want to apportion a different write-down percentage for each component, go to Step 4.
• Transaction Date — Enter a date for the journal entry for this transaction. If the field is blank, the system will use the date when the revaluation is processed. The revaluation date must be on or after the Last Depreciation Date.
• Transaction Reference — Enter a reference to identify the journal entry for this transaction.
• Write-down Amount – The write-down amount will be computed based on the Current Cost and the Write-down %. You can enter a write-down amount to override the calculated value. This amount is subtracted from the current net book value. For compound assets, the write-down amount will display the total write-down of all the components.
• Adjusted Residual Value – Enter the new residual value of the asset.
• Adjusted Lifetime – Enter the new lifetime of the asset. When the adjusted lifetime is changed to a period that is equal to the last depreciation period, the status of the asset will be set to Fully Depreciated. If the asset’s revision rule is set to Current Period, the current net book value will equal the residual value, and the cumulative depreciation will equal the asset current cost.
• Adjusted Depreciation Method – Select the new depreciation method that will be used to depreciate this asset.  write-down amount based on the write-down percentage.

3. Click Calculate to compute the write-down amount based on the write-down percentage. If the Multi-Book Accounting feature is enabled on your account, clicking Calculate will also enable the revaluation fields of the selected accounting books. If this feature is not enabled on your account, you do not have to click Calculate. The revaluation fields will be enabled when you select an asset

Note: If you are revaluing a simple asset, any changes you make to the accounting book selection and the write-down percentage requires you to recalculate the write-down amount. When you removed an accounting book for example, you need to click Calculate to remove the accounting method of that book from the revaluation. If you are revaluing a compound asset, you can click Process Revaluation regardless of any changes you make after calculating the write-down amount.

4.If you want to revalue only a specific component, or enter different write-down percentages for each component, go to the Component section. Enter the write-down percentage for the component you want to revalue.

5. Click Process Revaluation. Journal entries are created to post the difference in value. A revaluation depreciation history record will be written to each component of the compound asset. The compound asset record will have a list that shows the total of all the component revaluation, but will have no journal entries. You can find the journal entries in the component asset record under the Components > Depreciation History subtab. If you have enabled the Custom Transactions and Use Custom Journals preference, a specific journal entry will be created for asset revaluation. You can view these journal entries in Fixed Assets > Transactions > Journal Types. Note that you have to manually set the status of the journal entry to Approved before it is posted.

Note that if the Require Approvals on Journal Entries preference is enabled, and you do not have permission to approve journal entries, the system will require administrator approval before a journal entry is posted.