If you are eligible for the BC Sales Tax Credit, TurboTax will automatically include the credit and show it on two different summaries: Line 479 of the Detailed Tax Summary and on the British Columbia Tax & Credits Summary.
This credit is "income tested" and the maximum income threshold for receiving any portion of the credit is $18,750 for individuals, and $25,500 for spouses combined.
https://turbotax.intuit.ca/tips/claiming-the-british-columbia-sales-tax-credit-5488