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OSX 10.12.2, default bash terminal followed by dash, longhand.
Last login: Tue Jan 10 20:16:48 on ttys000
AMIGA:amiga~> var='00000-123'
AMIGA:amiga~> echo $(($var))
-123
AMIGA:amiga~> dash...

a bit convoluted, but doesn't rely on the fixed-width and/or hardwired column width values, but:

awk -F'T0+[1-6]+0' '/^T/{print (($2~/-/)?substr($2,index($2,"-")+1):$2+0)}' myFile
You can change...

It isn't really clear to me what you're trying to do in cases where there is no <hyphen> character in your output from awk. Is a return value like 000000234 to remain unchanged or do you want to...

Try
awk '{X = substr ($1,7,9); sub (/^0+/, "", X); print X}' file
234
-123
234
234
-11234
234
234

Hello sekfarok,

Still 100% not sure, could you please try following.

awk '/^T/ && /-/{split($0, A,"-");print "-"A[2]}' Input_file
or
awk '/^T/ && /-/{sub(/.*-/,"-");print}' Input_file
...