Factors set up a host of groups for you by default, and many of these work right out of the box, for example- organic search, paid socials, emails, etc.

The others can easily be set up by adding your customs rules to the groups. These take care of your marketing set-up and campaign information.

To add more sources to an existing channel, start by clicking on the 'Add new' up top.

Now you can just write the channel name [say paid social] and then click 'select property.'

Look for a property that you want to record as paid social and select it.

Once done - hit save and bam its done.