Use of prefilled forms

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I would like to give my users one of two options in filling up a long form

Either [i] Filling it up in one, OR
        [ii] two or more settings

-if [ii] By providing some pre-filled fields to be supplied in the form
on user's request.

The user fills in a preliminary set of data that is entered into a
"temporary" table in the MYSQL DataBase.
On returning & continuing, the user fills in data that enables the
identification of his/her previous entries in the database. The DB
entries are read and the appropriate (previous or preliminary) fields
are populated.

Does anyone have any ideas on this, seen it around, or any scripts that
could be easily integrated into performing this function

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