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You can cast a spell at a lower caster level than normal, but the caster level you choose must be high enough for you to cast the spell in question, and all level-dependent features must be based on the same caster level.
(Magic Overview > Casting Spells > Caster Level)
You can manifest a power at a lower manifester level than normal, but the manifester ...
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A typical manifester generally can't opt to have a power affect a littler area
No general rule says that a manifester can change a power's listed area. However, manifesting a power at a lower manifester level can change a power's area if the power's area depends upon the power's manifester level. That is, on Manifester Level says
You can manifest a power ...
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