Creating a table with user input

I am new to this and am trying to read a user's input which consists of a start date where the month is in B6 (a drop down list: JAN, FEB, MAR, etc.) and the year YYYY is in C6 and an end date thats in the same format directly below in B7 and C7. I then want to display the results as column headings(MMM-YY) starting in row B9. For example, B6 = JAN, C6 = 2011, B7 = MAR, C7 = 2011 I want JAN-11, FEB-11, MAR-11 to appear as column heading.

Please enter the following formula in cell B9.
=B6&"-"&C6

Please enter the following formula in cell C9.
=B7&"-"&C7

You will get result.

Thanks.