For Online, if you are in the same account as you used last year, then your 2018 information will automatically transfer to your 2019 return.

Why didn't last year's tax return transfer over in TurboTax Online?

https://ttlc.intuit.com/community/prior-year-return/help/why-didn-t-last-year-s-tax-return-transfer-...

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Transfer last year's return to 2019 TurboTax for Windows

https://ttlc.intuit.com/community/entering-importing/help/transfer-last-year-s-return-to-turbotax-fo...