To enter subcontractors' costs you use the Inventory section of the T2125. This screen is found directly after the Business Income section. Enter your subcontractor costs on the line marked "Subcontracts : Enter all the costs of hiring outside help to perform work related to the goods you sell."

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I do not see this window. Could you please show me a screenshot of the page?

Here is the screenshot that you requested: 

Thank you. I cannot find this page to save my life. Is there a box I should have selected previously in order to get it to populate? On my screen after I finish with income, it goes directly into expenses. 

You have to answer “Yes” to the question “Did you sell products that you bought or manufactured?” to see the inventory section.

Thank you Susan. I'm so sorry but I don't get that page. This is what comes up for me. After I click continue on the self-employment income page, it brings me to the "Do any of these situations apply" page. After I input the GST information, it brings me to the income summary, and then after I click continue it brings me to the expenses section. No mention anywhere of inventory or subcontractors. 

Can you please confirm which type of work you do as self-employed? 

Custom cabinetry