Ok, so Ive worked on this a little more, and I think I am on the right track but still getting errors. I looked at the Wiki pages again and it says what I need to do is Create a custom field to extract the month in numeric and then another custom picklist field with the Q1, Q2, Q3 and Q4 in it.
So I created a custom field at the Timesheet level called Month.
The workflow rule Wiki says to use for this is Month($ReportedDate) but I am getting the error "Error: Formula evaluation result data type is Numeric instead of expected Boolean"
I dont get it, I am doing exactly what Wiki says to do. Am I on the right track and how can I get rid of this error?