Do I have to input the address for the same client multiple times on different claims?

Client / policyholder address can be the same as the peril address - or different.

Typically the client address is the mailing address, and the loss address is just that, but many times they are the same.

You do not have to enter it twice, the policyholder address is sufficient if the loss address is the same. There is a toggle button to indicate that.