SolidWorks not linking to excel design table?

Hi,

I am using a design table for an assembly I created. I create a blank design table, then I click on a feature dimension in my assembly but the excel box stays empty; the excel sheet & solidworks appear to not be communicating. 

Can anyone provide any assistance? Why are the variables not populating?

Can I do this in a more manual way?

Any input appreciated, thanks!

SolidworksGeneral