Where do I claim courses I took to expand my small business offering?

If you are a small business owner then you are eligible to claim expenses associated with courses you may have taken to expand your small business using the form T2125. 

Yes, I had found that - would it just be the other category?  I really did not see anything else that fits.  Is there a maximum?  I had done some substantial amount of courses to offer a new arm of my business.  

Yes, you would just use Other.

Please note that you can only claim courses that upgraded or maintained your current skills as business expenses. If you took courses to acquire new skills, then these would be considered capital expenses, which can't be claimed on your T2125. You may still be able to claim them as tuition, and you might be able to use the Canada training credit (CTC) as well.