What is the correct method to change mount point?

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Current setup:

swap    hda1
/home  hda2
/          hda3
(based on this layout, /usr/local and /var should be on hda3?)

I'll be installing another HDD (partitioned into hdb1 and hdb2). How
should I go about changing the mount point for /var and /usr/local
from hda3 to hdb1 and hdb2 respectively?

Future setup:

swap        hda1
/home      hda2
/              hda3

/var          hdb1
/usr/local  hdb2

Thanks !
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