sorting problem in excel 2003 - 2007

I have a spreadsheet for work that consists of various columns of data. One important sorting column would be Job #. Inside this coulumn are data like 134-Q and 2355-P and 755-P for example. The sort now is like posted. I would like to be able to sort by both alphabetical and numerical order. ie, 755-P, 2355-P, then 134-Q. can someone help?