the process is:
A root CA is created
This root CA is empowered to create certificates for other servers
In case the CA is unknown to the browsers, these will prompt for certs issues by this CA. Whereas if the CA is known to the browsers a trust has been built and the broswers won't prompt for certs comming from server.
So if the CA is trusted, there is no need to reimport any server certs, even if they are regenerated.
For you case, just import the CA and you will be fine for the next 10 years.