How To Stack Builder Items In The Same Colum

I desperately need to know how to to "stack" multiple Muffin Builder items in the same column! 

For example:  Let's say I have a section that is a 3 column layout, and I want an image item in the first column as well as a video item below it.  Maybe even a text block item below those two items as well - but all in the same first column of the 3 column section.  How can I achieve this as I can not figure it our for the life of me!!!! 



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