Would the numerous CC applications and cancellations affect the CBS credit score?

No not really. As long as you pay your bills on time and in full, it shouldn't affect your credit score at all. Your credit score is tied based on how well you can manage your credit responsibly, take for example in a business. You would be okay to give credit terms to someone who pays on time, rather than those who always make late payment.

If you pay off your bills on time and in full, no. in fact, doing so can even improve your credit score over time as you show the bank you are capable of using credit responsibly. the problem comes when you forget a payment, or carry a balance.

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