Allot Free Space From One Partition To Other

I have a RHEL 5.3 machine with the following partitions and free space:

Free space on the partitions
/ : 74GB
/boot : 81MB
/var : 73GB
/home : 37GB
/icat : 758MB
/opt : 1.5GB

Now is it possible to allot a free space of some other partitions to /opt? I want around 100 GB more space on /opt. Thus, if it is possible I could move 50GB from /var and /20 GB from /home to /opt. This can make at least 70 GB space available.
What are other possible ways to increase space on /opt?
Thanks in advance !!!


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