Unless you are using TurboTax for Desktop and can access Forms Mode, there is no option for entering the supplemental information for these codes.
This information will be used only if your net losses from all businesses are more than $289,000 ($578,000 if filing a joint return). If this doesn't apply to you, leave Box 20 Code AJ blank (or do not include this code).
If the excess business loss does apply to you, this information will allow you to figure any excess business loss limitation that may apply. See IRS Instructions for Form 461 - Limitations on Business Losses. TurboTax does not include Form 461, which must be attached to your tax return (print and mail).