Hello @iisla.1 and welcome to Community :),
I advise you to get inspired form the RCC_ClockConfig example available in STM32CubeF7 package and in STM32CubeH7 package.
These examples supported many toolchains such as IAR and STM32Cube IDE.
For more clock configuration details, I advise you to refer to the STM32F7 references Manuals and STM32H7 references Manuals.
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Thank you
Kaouthar
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