How do i update custom properties that have been imported from NPM

Sometime ago we imported several custom properties from NPM into our NCM database to help with grouping the nodes etc in NCM. We use these properties to store data like circuit info for the CPE etc and as devices are updated and upgraded so do the circuits. How do i update the custom properties in NCM to match the change in NPM?

I am running NCM 6.1 and NPM 10.1.2.

Thanks