How to split files and use data from inside the data to name the file

A new question to a new format of file i need broken up.
Last time i asked it was different, and I did not know how to reopen question.

1) Replace any "&" in file to "H"
2) Replace any "#" in file to "I"  (Letter I)
3) Break file by $$$$$$$.
4) Use the second entry in the $$$$$$$$ as part of the file name
5) Remove the $$$$$$$$ from the new file
6) Place new file into a new directory

Parameters

$INDIR = /data/out/
$OUTDIR = /data/newout


Input file:

Name sad.123.sad

$$$$$$$$|I231_0081788682|
HEADER|INV|20180224|20180224||0004165036|0004165036|0081788682|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788682|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788682|20|180182C02|20180118
&EADER|DELV|20180224|20180224||0004165036|0004165036|0081788682|||||||||||
#TEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180211C01|20180121
#TEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180503C02|20180219
#TEM|900001|20|87QS5930150|1381|9999|200|CS|0081788682|20|180181C01|20180118
#TEM|900002|20|87QS5930150|1381|9999|100|CS|0081788682|20|180182C02|20180118
$$$$$$$$|I231_0081788684|
HEADER|INV|20180224|20180224||0004165036|0004165036|0081788684|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788684|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788684|20|180182C02|20180118
&EADER|DELV|20180224|20180224||0004165036|0004165036|0081788684|||||||||||
#TEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180211C01|20180121
#TEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180503C02|20180219
#TEM|900001|20|87QS5930150|1381|9999|200|CS|0081788684|20|180181C01|20180118
#TEM|900002|20|87QS5930150|1381|9999|100|CS|0081788684|20|180182C02|20180118
$$$$$$$$|I266_0081788699|
HEADER|INV|20180224|20180224||0004165036|0004165036|0081788699|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788699|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788699|20|180182C02|20180118
&EADER|DELV|20180224|20180224||0004165036|0004165036|0081788699|||||||||||
#TEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180211C01|20180121
#TEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180503C02|20180219
#TEM|900001|20|87QS5930150|1381|9999|200|CS|0081788699|20|180181C01|20180118
#TEM|900002|20|87QS5930150|1381|9999|100|CS|0081788699|20|180182C02|20180118

Break into files (This sample above is 3)

1  File    Should be named:  I231_0081788682_02252018_051500.txt

HEADER|INV|20180224|20180224||0004165036|0004165036|0081788682|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788682|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788682|20|180182C02|20180118
HEADER|DELV|20180224|20180224||0004165036|0004165036|0081788682|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788682|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788682|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788682|20|180182C02|20180118

2) file: should be            Should be named:  I231_0081788684_02252018_051500.txt
HEADER|INV|20180224|20180224||0004165036|0004165036|0081788684|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788684|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788684|20|180182C02|20180118
HEADER|DELV|20180224|20180224||0004165036|0004165036|0081788684|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788684|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788684|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788684|20|180182C02|20180118

3) File   name    Should be named:  I266_0081788699_02252018_051500.txt
HEADER|INV|20180224|20180224||0004165036|0004165036|0081788699|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788699|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|0081788699|20|180182C02|20180118
HEADER|DELV|20180224|20180224||0004165036|0004165036|0081788699|||||||||||
ITEM|900001|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180211C01|20180121
ITEM|900002|10|4L7S6101367|1381|9999|100|CS|0081788699|10|180503C02|20180219
ITEM|900001|20|87QS5930150|1381|9999|200|CS|0081788699|20|180181C01|20180118
ITEM|900002|20|87QS5930150|1381|9999|100|CS|008178869|20|180182C02|20180118