Dynamo for repetitive units

hello all ,
i am working on a project where there are repetitive resedential units .
i saw an interesting video on AU for someone who used a placeholder for managing repetitive units through dynamo .
Does anyone know any resources or keywords that i should use ,to help me create this workflow

that is the module that is repeated around 20 times per floor in the AU video

link for the AU video :

the placeholder part start in 19:03

Thanks for any help

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