Hii,
Create Asset, Compute Depreciation, Then Manually Edit Depreciation Lines
Steps (Quick Recap):

o to Accounting → Assets.

Create a new asset (with full original value and already depreciated amount).

Click “Compute Depreciation”.

Go to the Depreciation Lines tab.

Edit the first line: set the original start date (e.g. Jan 2023).

Adjust amounts/dates of old lines if needed.

Click Confirm.

Method 2: Import Assets + Manual Depreciation Lines

If you're using import:

1. First, import your assets normally.
2. Then, go to Accounting → Assets, open the asset.
3. From the depreciation tab, manually add lines with:
   • Correct historical depreciation dates
   • Amounts already depreciated
   • Ensure remaining lines match the remaining schedule

You may need to disable auto-generated lines by setting the method to manual and entering all lines yourself.