depreciation

emailed last week, wanting to use my own form 4562 and adjust the depreciation turbo tax is calculating vs what I have on my depr schedule. I was told I could adjust by doing an override in the asset entry worksheet but would have to probably print and mail. fine with that but still don't see how to do it. I can adjust my depreciation by using a shorter depreciation life and work it to it gets real close but everything pops up 39 years, how do I adjust or put in or change the useful life