Thanks for that. i tried playing around with it for a while but didn't get anywhere. I think I lack some basics in VB? 
I'll try to give some more info and some Pseudocode. Below is how my Sub starts. The Workbook containing the data I need to pull will be called WB-09-08-15.xls in what follows.
Since the date changes every 15 days (the next being 09-08-30), I would like to be able to perhaps pass the filename as a parameter to the main sub.
So i would have
The tricky part is the sub runs by clicking a button that is in my worksheet.
So ideally I would like to be able to
1- Click the button.
2- Be prompted to enter the FileName or browse for it.
3- Have that Filename passed as a parameter.
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