I assume you mean you uploaded a form 1099-DIV from your broker into TurboTax and it didn't properly reflect your dividend income. The IRS will match the 1099-DIV information with your tax retun and if it doesn't agree they will probably question the entry.
You mention entering individual entries as opposed to a summary entry, that would be fine if the individual entries are reported on 1099-DIV forms. Otherwise, your entries are still not going to match with what is reported to the IRS.
If your entries don't agree with the 1099-DIV you can still make them, but you should attach a statement to your tax return explaining the discrepancy. Otherwise, you can wait to see if the IRS questions your entries and then you can explain to them your justification for making them.
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