You only want to auto-fill once. You do not auto-fill your T-Slips to go in twice- it will double your income.
Capital Gains are reported on T5008s (stocks), T3s (trusts), and T5013s (partnerships) and can be self-entered on Schedule 3 within TT0 under "Income > Investments > Capital Gains and Capital Gains Deduction Profile".
For the slips, if you auto-fill your T5008 review them make certain they are entered as Capital Gains and not Investment Income, as there is a choice to be made.
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