How do I override the depreciation basis of my business vehicle? CPA took special depreciation allowance the first year my vehicle was put in service.

How do I override my business vehicle depreciation basis in turbo tax? My CPA took a special depreciation allowance the first year my vehicle was placed in service in 2012. Turbo tax did not ask for prior year special depreciation allowance amount. So the current depreciation basis is overstated by that amount.