WV Teacher Retirement

While trying to file my WV state tax on Turbo Tax, it told me that my WV teacher retirement was only partially taxable and that I could subtract $2,000 of that pension total or $8,000 of all my combined pensions if I am 65 or older.  It supposedly did it automatically and then told me to adjust my federal to show the adjusted amount.  I am not sure how to do this and am leery of entering amounts that are not on my actual 1099-R.  Can anyone clarify this to me or point me in the right direction, because I do not want to make a mistake. Thanks in advance!