Box 21 of the T5008 : This is the total amount of money received by or credited to the recipient in exchange for the securities.
You have to prepare a T5008 slip for all reportable transactions, regardless of the amount of proceeds. There is no administrative limit for reporting securities transactions. Enter, in dollars only, the total proceeds received by or credited to the recipient in exchange for the securities.
This is used in calculating the net investment income or capital gain/loss. For capital types of income, this is transferred to Form S3 SUPP, Schedule 3 Supplemental Statement and Schedule 3, Capital Gains or Losses under Proceeds of Disposition.
T5008 -Statement of securities transactions: https://bit.ly/2TocUvr.
From TurboTax FAQ on how to enter a T5008 https://turbotax.community.intuit.ca/replies/2647749
