Is it possible to install an existing server (DS removed) into a new
(to be created) one server tree without completely reinstalling the OS?

I could not - problem was the configuration of LDAP - this was somehow
corrupted and because edir was not configurable through iManager or C1,
due to an -618 error, no real chance to correct that.

My (in the end unsuccessfull) steps were adding edir via nwconfig and
adding certificate server via Netware GUI install.

Besides of the LDAP - Edir config problems everything else was o.k like
ncp file-access, adding user rights via Novell Client and adding users
and groups via the antique netadmin method (since nwadmn32, C1 and
iManager did not work).

W. Prindl