Custom clean install from recovery ?

hello.
want to clean install 10.8.3 using app store through recovery mode.
my question:
as i recall, i have access to disk utility before the new download, soooooooooo,
will disk utility allow me to partition my mac's hard drive (after erasing) and THEN download the OS onto the start-up partition?
or, do i have to go through the rigamarole of creating a ML DVD?
thanks. all help deeply appreciated.
[have owned a new 27" for close to three weeks now and am still mucking about trying to configure it and retain files and users and passwords, etc from previous mbp. due to my previous failure to understand the consequences of having multiple apple id's (that i never wanted, but am nevertheless stuck with), this will be my second clean install. grrrrr.]

oh oh.
i erased the hard drive so that i could make partitions.
only then did i learn and understand the small print on the screen that says "you may only split this partition into two."
i had hoped to make four partitions.
i have created as many as four partitions on external drives in the past, so did not anticipate this restriction on my imac hard drive.
guess i'll forget the partition idea and restore my imac with a clean install and then migration assistant.
i fear that i know the answer to this next question, but...
if i were to go ahead and create the two partitions allowed on my imac's hard drive, would it be possible in the future - when feel that i no longer need its contents - to eliminate it and merge the space with the start-up partition?
[life would be so much easier if i had a billion dollars so i could afford two or three apple computers...]
thank you for your responses.

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Andy ______________________________________
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Custom clean install from recovery ?

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