Yes, if you have more than one employer, you need to check the "more than 1 employer" box on the form and follow subsequent instructions.
However specific to your case, it is advisable to check with your first employer about the computation and deduction of the employment taxes from your first employer and then fill up the TD1BC form accordingly. Your accounts / HR department maybe able to help you with the same.
For more information on the TD1BC form please refer - TurboTax TD1BC Form
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