How to copy last record to a new record ?

Hello,
i have a question pls.
i want to copy last record to every new record
say,
multirecord forms has : Tank_no Last_measured Lab_Denisty
record1 : 1009aw 1532.94 .5796
what i want to do next record is copying last record (record1 ) as
record2 : 1009aw 1532.94 .5796
so the user may change the Last_measured only and not to have to rewrite the Tank_no and the Lab_Denisty cause it doesn't change.
May i do this ? if yessss, but How..?
Regards,
Abdetu..

Hello poelger
i check it then found the following code :
DUPLICATE_RECORD Examples /*
** Built-in: DUPLICATE_RECORD;
** Example: Make a copy of the current record and increment
** the "line_sequence" item by one.
DECLARE
n NUMBER;
BEGIN
** Remember the value of the 'line_sequence' from the
** current record
n := :my_block.line_sequence;
** Create a new record, and copy all the values from the
** previous record into it.
Create_Record;
Duplicate_Record;
** Set the new record's 'line_sequence' to one more than
** the last record's.
:my_block.line_sequence := n + 1;
END; but then which trigger best fit the procedure should i use
w-c-r or w-n-r-i Triggers
and what is meant by line_sequence pls. ?
Regards,
Abdetu..

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