Zend certified PHP/Magento developer

Working on a single in channel in GIMP

I’m using GIMP 2.10.22.

I have an RGB color image, and I want to do work on one of the channels, without affecting the others. How can I copy the channel into a new image, work on it there, then copy it back to only overwrite a single channel? And is that the appropriate way to work on an individual channel?