After-tax Portion of Pension Direct Rollover to Traditional IRA

I elected a pension lump-sum traditional direct rollover into an eligible traditional IRA at my Institution.

A portion of this lump-sum rollover was after-tax contributions and not subject to tax.

My Institution placed this after-tax portion into a ROTH account.

For this non-taxable portion, I received a 1099-R with block 2a taxable portion = to block 1 gross distribution, block 2b taxable amount not determined was checked and block 7 distribution code was 2 with IRA box checked.

How do I enter this into Turbotax so this after-tax portion is not considered taxable income?  Would it be similar Turbotax steps for a backdoor ROTH?