How can I update collection from another section

Shopify Partner
1 0 1

Hello guys Im stuck with an implementation today we bought this section
and basically the main problem is that to use it you must select a collection to load the products 

the thing its I made a collection slider and based on this selection I should display the products of the build a box section 

this is how it looks (with a collection already loaded),  Im kind of new developing in the shopify environment, so If someone can help me with this I would be very thankfully 



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