No. If you've already added your T5008 slips to your return, you don't need to report those transactions again in the Capital Gains/Loss section. Just make sure to go through your T5008 slips and make sure that the "Type Of Income" is "Capital Gains", and that all the needed information is there.
You can put your "Outlays & Expenses" in the Capital Gains/Loss section if you have expenses that are common to more than one of your T5008 transactions.