Holding company dividend received

How do I tag dividend received from subsidiary company? It’s exempted from corporation tax. What type of income is excluded in tax calculation?

Looking to move cash sat on the balance sheet of the subsidiary company to the holding company.

The subsidiary company has made a profit of approx £200k last tax year and projected to do the same this tax year.

Looking to move approx £450k from the balance sheet to the holding company.

on bank tagging which nominal code do I post this against so it doesn’t affect corporation tax for the holding company?