How to delete file systems from a Live Upgrade environment

How to delete non-critical file systems from a Live Upgrade boot environment?
Here is the situation.
I have a Sol 10 upd 3 machine with 3 disks which I intend to upgrade to Sol 10 upd 6.
Current layout
Disk 0: 16 GB:
/dev/dsk/c0t0d0s0 1.9G /
/dev/dsk/c0t0d0s1 692M /usr/openwin
/dev/dsk/c0t0d0s3 7.7G /var
/dev/dsk/c0t0d0s4 3.9G swap
/dev/dsk/c0t0d0s5 2.5G /tmp
Disk 1: 16 GB:
/dev/dsk/c0t1d0s0 7.7G /usr
/dev/dsk/c0t1d0s1 1.8G /opt
/dev/dsk/c0t1d0s3 3.2G /data1
/dev/dsk/c0t1d0s4 3.9G /data2
Disk 2: 33 GB:
/dev/dsk/c0t2d0s0 33G /data3
The data file systems are not in use right now, and I was thinking of
partitioning the data3 into 2 or 3 file systems and then creating
a new BE.
However, the system already has a BE (named s10) and that BE lists
all of the filesystems, incl the data ones.
# lufslist -n 's10'
boot environment name: s10
This boot environment is currently active.
This boot environment will be active on next system boot.
Filesystem fstype device size Mounted on Mount Options
/dev/dsk/c0t0d0s4 swap 4201703424 - -
/dev/dsk/c0t0d0s0 ufs 2098059264 / -
/dev/dsk/c0t1d0s0 ufs 8390375424 /usr -
/dev/dsk/c0t0d0s3 ufs 8390375424 /var -
/dev/dsk/c0t1d0s3 ufs 3505453056 /data1 -
/dev/dsk/c0t1d0s1 ufs 1997531136 /opt -
/dev/dsk/c0t1d0s4 ufs 4294785024 /data2 -
/dev/dsk/c0t2d0s0 ufs 36507484160 /data3 -
/dev/dsk/c0t0d0s5 ufs 2727290880 /tmp -
/dev/dsk/c0t0d0s1 ufs 770715648 /usr/openwin -
I browsed the Solaris 10 Installation Guide and the man pages
for the lu commands, but can not find how to remove the data
file systems from the BE.
How do I do a live upgrade on this system?
Thanks for your help.

Thanks for the tips.
I commented out the entries in /etc/vfstab, also had to remove the files /etc/lutab and /etc/lu/ICF.1
and then could create the Boot Environment from scratch.
I was also able to create another boot environment and copied into it,
but now I'm facing a different problem, error when trying to upgrade.
# lustatus
Boot Environment           Is       Active Active    Can    Copy     
Name                       Complete Now    On Reboot Delete Status   
s10                        yes      yes    yes       no     -        
s10u6                      yes      no     no        yes    -        Now, I have the Solaris 10 Update 6 DVD image on another machine
which shares out the directory. I mounted it on this machine,
did a lofiadm and mounted that at /cdrom.
# ls -CF /cdrom /cdrom/boot /cdrom/platform
/cdrom:
Copyright                     boot/
JDS-THIRDPARTYLICENSEREADME   installer*
License/                      platform/
Solaris_10/
/cdrom/boot:
hsfs.bootblock   sparc.miniroot
/cdrom/platform:
sun4u/   sun4us/  sun4v/Now I did luupgrade and I get this error:
# luupgrade -u -n s10u6 -s /cdrom    
ERROR: The media miniroot archive does not exist </cdrom/boot/x86.miniroot>.
ERROR: Cannot unmount miniroot at </cdrom/Solaris_10/Tools/Boot>.I find it strange that this sparc machine is complaining about x86.miniroot.
BTW, the machine on which the DVD image is happens to be x86 running Sol 10.
I thought that wouldn't matter, as it is just NFS sharing a directory which has a DVD image.
What am I doing wrong?
Thanks.

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