Batch script to Split File based on text position in a file

I have below two lines in a file abc.txt

Line 1 :

000000001E3TBRK0279800B0000002952015103000463703000556675000618930000478172000481698000571272000581162000465785000362375000499499

Line 2 :

000000001E3TNSK0279800P0000000012015103000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Line 3 :

000000001E3TBRK0279800B0000002952015103000463703000556675000618930000478172000481698000571272000581162000465785000362375000499499

Line 4 :

000000001E3TNSK0279800P0000000012015103000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Line 5 :

000000001E3TKSN0279800P0000000012015103000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000

I want these records to be splitted into files based on the text from position 13 to 15.

For example; Line 1 and Line 3 are having BRK in position 13 to 15 and I want these two lines a new file naming abc_BRK:

For example; Line 1 and Line 3 are having NSK in position 13 to 15 and I want these two lines a new file naming abc_NSK:

For example; Line 5 have KSN in position 13 to 15 and I want this one line a new file naming abc_KSN:

Values should be picked dynamically from file and should create files dynamically.