Active Directory authentication into subtree sctructure

Dear, I've implemented a Freeradius service that let authenticate users with PEAP/MSCHAPv2/NTLM against an Active Directory tree from a Windows Domain Controller server. In this scenario every user is authenticated developing a search from the root of the Active Directory tree. Suppose my domain is "company.com", and now I need to authenticate users against some subtrees like these: sales.company.com support.company.com and not from the AD's root: company.com Is this possible to do this with my current implementation? Thanks in advance, regards.