how to sync AD DS to AD LDS instance on a workgroup server?

i found the system 's help document was not detailed enough.

and i searched the forum, found some titled AD DS to AD LDS, but those did not help.

so i ask your help here.

i can configure the sync from AD DS to an AD LDS instance in the domain.

but now i wanna sync AD DS to an non-domain ( workgroup ) server's AD LDS.

can you tell me how?

 thank you.!

I;m Charles Lee.