Yes, you can convert funds in a Traditional IRA to a Roth IRA.
If all of the money in the Traditional IRA is pre-tax, then everything that is converted to the Roth IRA will be fully taxable. If the Traditional IRA contains a mixture of pre-tax and after-tax money, then some of the converted funds may not be taxable, but the total value of all of your Traditional IRAs will be a factor to determine the taxable amount.
See the following TurboTax help article to learn more:
What are traditional IRA to Roth IRA conversions?
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