Splitting a Multidimensional Array

So I'm trying to write a function that can do Dot Product calculations on arrays. I want to use the SumProduct worksheet function to do this. I demonstrated what I'm trying to do on the worksheet with the attached image:




I want to do this using VBA, and for each column of W. The issue is that W is a two dimensional array and I need to split each column into its own array. I'm not sure how to do this efficiently. Or how to do it period.

Any thoughts on how I can split W column wise?

Thanks

Attached Images