...
Problem: How to change the type of Fixed Asset to Intangible Assets?
Solution: Make editing as shown below.
The fixed asset 1. The Fixed Asset is accepted to accounting through the document Entry Opening Balance Entering as entry of initial balances.
Depreciation is :
Current type of assets is Fixed Asset:
Please find more information about Fixed Assets here 12. Asset Management
2. Depreciation is already accrued monthly on this Fixed Assets.Asset:
3. Cancel the Month End Closing of the month for all periods of depreciation.:
Enter the document Entering 
4. Go to corresponding document Opening Balance Entering of the initial balances. Change :
And change the type of asset to Intangible Assets.:
Then re-close the documents Closing the month.
Post and close Opening Balance Entering:
5. Execute Month End Closing for all the previous periods that were cancelled:
Amortization for Intangible Asset is recalculated:
Thank you for being a FirstBIT customer!