[Samba] how to populate Samba AD DC with groups and users?

[Franta Hanzlik]

Hi Samba experts,

I built a new Samba 4.16 AD DC and did the initial provisioning. Now I'm 
working on how best to deploy groups and users - when I have the old Samba 
4.0 AD, where the same users and groups already exist (basically, this is a 
migration from the old server to the new one, but the domain/realm on old 
and new are different).

What is the best way to perform this migration? Exporting users and groups 
from the old server to ldif using ldbsearch is probably the first step, but 
what next?

TIA, Franta Hanzlik