Coaches who are renewing their Accreditation+ can roll over up to 6 CPD credits to their next Accreditation year. This is an automatic process if you have more than 15 CPD credits at the time of renewal, so no action is required from you.
You can view how many CPD credits you have accumulated (and how many are rollover credits) in your Coach Hub.
As this is a benefit of renewing Accreditation+, CPD credits will not rollover if you upgrade from the base tier of Accreditation, or if you are entirely new to the scheme.