For donations made via the Combined Federal Campaign (payroll deduction), how do I enter it in Turbotax?

Yes, if you know the total amount you donated to the Combined Federal Campaign in 2023, you can claim it as a Charitable Deduction in one entry in TurboTax.

Here's more info on How to Enter Charitable Donations. 

I'm a retired Federal Employee and contribute to CFC also.  I enter all of mine as Combined Federal Campaign, PO Box 99, Haymarket, VA 20168.  Just a word of caution, do not depend on the contribution statement that is listed in the CFC website.  Take the actual deductions from your payroll statement or OPM annuity statement (year-to-date) for the entire year.