Yes, the second import probably overwrote the first import. You could delete the second import with two lines of dividends, and re-import the one with 50 lines.
If the dividends are from the same payer, you could also make a one-line entry for the box totals in the Dividends section.
Here's How to Enter a 1099-DIV.
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I am using desktop TT. After completed the 50 lines of dividends in TT, I imported additional 2 lines of dividends. Then cannot find the previous dividends in TT as they are all wipe out!
Yes, the second import probably overwrote the first import. You could delete the second import with two lines of dividends, and re-import the one with 50 lines.
If the dividends are from the same payer, you could also make a one-line entry for the box totals in the Dividends section.
Here's How to Enter a 1099-DIV.