Our AD setup includes a forest with multiple child domains. Can we connect to a domain in a forest?
How do we select a specific domain in the forrest?
Yes, you can target multiple domains (across a forest).
However, you will have to set up a different environment for each domain.
The key is to define the LDAP connection string for each environment to point to the domain that you are targeting.
See this post for more information on defining the LDAP connection string: How do I determine the LDAP connection string to use?