Simply awk/sed solution required - Split a file on fields - another additional question

Hi All,

A nice easy one being an extension of two previously answered questions. Should be nice easy points up for grabs.

For reference see the following two PAQ's:

First Question:
https://www.experts-exchange.com/questions/21763311/Simply-awk-sed-solution-required-Split-a-file-on-fields.html
Second Question:
https://www.experts-exchange.com/questions/21764891/Simply-awk-sed-solution-required-Split-a-file-on-fields-additional-question.html

The input is ever so slightly different, and the output required is ever so slightly different.
Ozo's answer from the second PAQ is great - it works.

So can base off this or re-work if you like.

------------------------------------------
INPUT ATTRIBUTES:

* Text file to be split into multiple files
* Delimeters start with two consecutive pipes and consist of 7 pipes

DELIMITER EXAMPLES:

a) ||XX|123456|A111|||
b) ||XX|123456|A111|0212345678||
c) ||XX|123456|A111|(02) 12345678||
d) ||XX|123456|A111|(02) 12345678|test@email.com|

a) The first example are the only compulsory fields
XX=company code
123456=booking which could be 5 or 6 digits
A111=series which is letter and number combo

b) Also contains a phone number

c) The phone number can contain spaces and brackets

d) Also can contain email address

AIM:

* To convert text file into multiple text files based on file names above
* Filenames should be unique
* Filenames should unclude YYYYMMDD_HHMM to ensure uniqueness
* Files produced should maintain the pipe delimiter as line number one
* Junk text found in file prior to first pipe should be discarded

INPUT FILE EXAMPLE:
VVVVVVVVVVVVVVVVVVVVVVVVVV
Possible junk text to be discarded
||AA|111111|E123|||
Contents of file one
||XX|222222|A111|(02) 12345678||
Contents of file two
||XX|222222|A111|0212345678||
Contents of file three
^^^^^^^^^^^^^^^^^^^^^^^

OUTPUT FILES PRODUCED:

AA111111_20060518_1614_001.DOC
XX222222_20060518_1614_002.DOC
XX222222_20060518_1614_003.DOC

NOTE:

AA111111_20060518_1614_001.DOC would contain:
VVVVVVVVVVVVVVVVVVVVVVVVVV
||AA|111111|E123|||
Contents of file one
^^^^^^^^^^^^^^^^^^^^^^^

Thanks in advance,