Taxpayer works in a tech company and made after-tax 401k contribution to the traditional 401K account and rollover the after-tax portion to the designated Roth 401K account through the in-plan conversion. Under the Income Section > Pensions, IRAs (1099-R) > Rollovers, do I need to to check the box "Rollover of non-designated Roth account to designated roth account”? What does this check box suppose to do?