Using batch, take specific numbers in a text file and sum them before writing the results back to the same txt file.

I'd like to use a batch file to sum some specific numbers in a text file, unfortunately I do not have the skills required. In the following text file "test.txt", for all rows beginning with "622..." I need the second block of numbers summed together and put in a line after the last "622..." line. The total must retain any leading zeros so that the result will always be 15 digits long. It should also line up with the spacing of the values above it. The first number in the total line is a constant, as is the “COMPANY NAME”. At the end of this total line, the “00724…” number should maintain the chronological order of the one above it.

Original txt file:

101 123456789123456789123456789123456789BANK NAME              COMPANY NAME                   
5200COMPANY NAME                        1234567891CCDPAYMENT   123456789123   1072414250000001
62202123456789123456789      000056998811365          CHEMICAL MASTER LTD     0072414250000001
622021321321456987568        000149897016984          CHEMCO USA INC          0072414250000002
622011233214569874563211     000017285016585          GUME INC                0072414250000003
6220225411123658954212       000270139112936          DIOVIK GROUP            0072414250000004
6220432211655548541232       000000632017155          SANVED ENTERPRISES      0072414250000005
820000000500112340500000000000000000497895191123456789                         072414250000001
900000100000100000001234732205000000000000000004949519                                       
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

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Example:

101 123456789123456789123456789123456789BANK NAME              COMPANY NAME                   
5200COMPANY NAME                        1234567891CCDPAYMENT   123456789123   1072414250000001
62202123456789123456789      000056998811365          CHEMICAL MASTER LTD     0072414250000001
622021321321456987568        000149897016984          CHEMCO USA INC          0072414250000002
622011233214569874563211     000017285016585          GUME INC                0072414250000003
6220225411123658954212       000270139112936          DIOVIK GROUP            0072414250000004
6220432211655548541232       000000632017155          SANVED ENTERPRISES      0072414250000005
6270154235698742245482       000494951975025          COMPANY NAME            0072414250000006
820000000500112340500000000000000000497895191123456789                         072414250000001
900000100000100000001234732205000000000000000004949519                                       
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

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Any help at all with this would be greatly appreciated!