Insert column of data (as array or array index) into another array column...

I'm curious if there is a method to insert a column of one array into a column of another without a loop using VBA only, and without transferring to a ws range.

I know it is simple enough to extract a column of data using Application.Index(array, , [column]), but then what?

I assume this is not possible with Excel but thought I would ask anyway.

Thanks