Multiple Base dn's

I am trying to figure out if and how it is possible to use multiple base dn’s. The reason is that this is for an Edirectory environment and we have multiple organizations. I can get it to work against one of them fine. I just can’t figure out if it is even possible to add multiple base dn’s. I have other products that use ldap for the tree and they are able to handle multiple base dn’s.

Thanks for any help.

https://www.ads-software.com/extend/plugins/wpdirauth/