SuSE has a YaST2 configuration item for configuring ldap. It also has a selection on the client computer (suse 10.3 again) to authenticate using different sources including samba, ldap, AD, etc. I don't know how much the wizard will set up for you on the server side. It may depend on whether you plan to replace or migrate.
There are three books that come with the samba-doc package. Samba-3 by example, Samba 3 - Howto and Reference Guide and Using Samba that deal with ldap. The Howto and Reference Guide has a migration section that might be useful. The Samba 3 by Example book has more step by step examples, but part of it may be performed by the wizard.
This IBM Redbook may be useful:
Also read the Documentation in the SuSE manual. The SuSE wiki might be useful as well.