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Where do I find AMT Net Operating Loss Carryover in 2018 to input into 2019 tax?"
TurboTax supports neither the calculation of an NOL nor an ATNOL, both of which must be calculated by the taxpayer.
In order to calculate an NOL, follow Publication 536 (link below is for use in 2018 returns).
See https://www.irs.gov/publications/p536
In order to calculate an ATNOL, you will need your Form 6251 and should follow the guidelines set forth below.
See https://www.irs.gov/instructions/i6251#idm139637784589312
