I'm also doing commercial part 141 with GI bill...I've already done instrument pt 141, I wonder since my instrument was taken 141 at the same school would that count into comm req.?
Nope.
It's all about what is required in the school's approved TCO. You have to do that.
I doubt that the school's commercial program says that the instrument counts towards the 120.
The big thing you'll want to do is check with the school. The basics for 141 Commercial is 120 hours,
however (there's an exception to every rule, eh?), that's the minimums for a normal commercial program. That means the school can require 150 or 200 or 900 hours for their commercial program if they want to. I'm not sure what the benefits would be, but they can do it if they get it approved.
Also, they can get a
special curricula approved. Airman Flight School in Norman, OK had a "short commercial" approved. I don't remember how many hours it was, but it wasn't the 120 for the commercial. Like anything, there's a catch. For their Private, Instrument and CFII they could self-examine (they had the authority approved after their first 2 years - mandated "waiting period" for 141 schools) but not for the commercial. That means that the students that graduated from that course had to use a DPE or Fed (and not the "in-house" DPE/Chief Flight Instructor either) as part of the approval.
So, while you can have less than 120 hours it's not common. Most common is going to be the 120 hour commercial program but you could theoretically have more than 120. I know of a school that has a 40 hour instrument vs. the "normal" 35. While it isn't common, it does happen.
-mini