This node is not unmanaged.  Both

75              IP Status                       Normal(2)
15              OVW Maps Managed                1

indicate that.  When a node is unmanaged, the maps managed count will be
zero and the IP Status will be Unmanaged.

You cannot automate what you don't understand, so your first job will be to
try to create smartsets to cull out the various PC's you eventually want to
unmanage.  Use ovobjprint to print the database, and then find
representative samples.  Then try creating smartsets to group them based on
common characteristics, vendor, isComputer, whatever.    This is likely to
be an iterative process.  Rome wasn't built in ad ay and neither will you
be able to get control of an out-of-control installation in a day either.

If there was no mandate to manage the PC's, then perhaps a better approach
than trying unmanage thousands of devices you don't care about would have
been to limit discover to just those things you do care about.  You can do
that in the seed file.  But then you have to delete and rediscover the
entire network.  serversetup gives you that option.

My 2 cents

James Shanks
Level 3 Support  for Tivoli NetView for UNIX and Windows
Tivoli Software / IBM Software Group