Yes. You can reuse a policy to manage more than one DNS name in one of two ways. First, you can create additional policy records using the policy. Note that there is an additional charge for using this method because you are billed for each policy record that you create.
The second method is to create one policy record using the policy, and then for each additional DNS name that you want to manage using the policy, you create a standard CNAME record pointing at the DNS name of the policy record that you created. For example, if you create a policy record for example.com, you can then create DNS records for www.example.com, blog.example.com, and www.example.net with a CNAME value of example.com for each record. Note that this method is not possible for records at the zone apex, such as example.net, example.org, or example.co.uk (without www or another subdomain in front of the domain name). For records at the zone apex, you must create a policy record using your traffic policy.