With any NOC code, you can see from the numbers what category it is.
If it starts with 0 like 0311, it is a manager position and falls under skill type 0
If it doesn't start with 0 but the 2nd digit is 1, like 1122, it is a skill level A position.
If it doesn't start with 0 but the 2nd digit is 2, like 1222 or 3 like 7311, it is a skill level B position.
If it doesn't start with 0 and the 2nd digit is 4 or 5, it's a skill level C and if the 2nd digit is 6, it's a skill level D.
You can find this and other info about NOC codes at
http://www5.hrsdc.gc.ca/NOC/English/NOC/2006/Introduction.aspx