Selecting horizontal line from deconstructing lunchbox

Hi, i wanted to select the specific horizontal lines from deconstructed panels. But i dont know how to sort. Is there any references to use list item in obtaining the following (sketched blue on png)? or is there any other alternative. Thank you
Truss (88.4 KB)

Truss mahkota Edited (88.5 KB)

Use dot product.

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Ah thankyou for the solution, do you mind if i ask what does the dot product filter? and whats the function for the second number? Thank you

Dot product gives direction attributes.

Best explanation in my opinion.
叉乘与点乘:可视化解释 - YouTube

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