Edit an Audience
On the Rule-based Audiences page, hover over an audience name and click on the three dots. From here, click on Edit. For read-only audiences you should see the option or Add new DSP.
Once one of these options are selected, you will have access on the top navigation to Details, Geo Targeting and Rules.
From there, you will be able to add another channel to an already existing audience in Details >
Distribution Channels by clicking on the Add Channel button and selecting the appropriate DSP.
To set geo targeting restrictions or edit targeting rules, please refer to the same steps outlined in the 'How to Create a Custom Audience' article.
Cloning an Audience
Simply hover over the audience record on the Rule-based Audiences page and click on the three dots. By selecting Clone you will have a new audience created with the same settings as an existing one.