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I have a root filesystem that takes up most of the hard disc space and I want to reduce the size of that and create a /u.
Why not just leave it? At this point, you are just looking at many hours of work.
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I have tried divvy amd mkdev fs but to no avail.
Yes, it wouldn't work since most of the space is in /. Lucky you didn't trash the whole thing.
Two options - start from scratch (wipe it all out and reinstall remembering to put in /u)
or
back it all up to tape, wipe it all out, create a / with less space, create your missing /u, and try to restore to the correct filesystems.