I'm not really sure what you mean by namespace:
A package's namespace?
All variable types with the same name(i.e. $var,@var,%var)? For this you could do a typeglob.

*foo = *bar;
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This line sets all of the variable types with the name foo to the values of the corresponding variable types with the name bar

Or do you mean all of a hash's or array's values? For this you could look into hash and array slices.

@arr[3,4,5,6] = qw(just another perl hacker);
@hash{'key2','key3','key4','key5'} = qw(jay dave guy);
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Note that with the hash slice we are using the symbol normally associated with arrays. That is because this the left operand is list of keys.

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Amel