You can add guides to your channel by clicking on the "add guide" icon from anywhere within the Guides software. It isn't moving the guide from the original channel - it will just add it to the new channel and will be kept up to date from the original author.

Note: You can only add guides that have the proper permissions, and you can only add them to channels where you are the owner or administrator.

To add a guide to a channel, simply click on the "add to" icon:

And select the channel you want to add it to.

To remove the guide from your channel you can click on the icon and remove it from the desired channel(s).