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I'd second this. From 2007...Why are they still not in the software?
Not sure what version you are using or if this is specifically what you were talking about but if you go to the design tab and click on insert frame there are various bar and channel sizes built in for various standards.
"Bar Size" means literally, dimensions less than 3".
There are no "Bar Size" channels.
never has been and probably never will be.
unless autodesk gets moving. This is not a professional package.
I use 2" x 1" x 1/8" Channel virtually every day.
Ryerson, Jorgensen and many others supply.