You can enter it in the Self-Employment/Business section (Form T2125).
If you're using TurboTax Online:
1. Click on the “Find” icon at the top-right corner of the return screen and search for “Self”.
2. Select “Self-Employment” from the list and then click the “Go” button.
3. Follow the prompts and enter the necessary information until you reach the "did you sell products that you bought or manufactured?" section.
4. Enter the values for your inventory in the boxes and press Continue.
Thank you for choosing Turbo Tax.