What account structure should be used to share Floodlight tags and audience lists between multiple Advertisers?
- An account/advertiser relationship
- A parent/child relationship
- Shared billing profiles
- A single Floodlight activity
In this arrangement, the parent advertiser defines a collection of Floodlight activities, tags, and settings (called a Floodlight configuration), and all of the child advertisers inherit the configuration.
Read more here: https://support.google.com/searchads/answer/2458167