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

I am new to windows bat scripting and require your inputs here.

I need help on .bat script 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 is having 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.

Thanks for your help in advance.

Thanks, Sunil