Duplicate a geometry with different sizes with grasshopper

Welcome to the community @Stéphanie Glad to have you here! :slightly_smiling_face:
Just to note in the future. It is just about always a good idea to attach minimal versions of code relevant to your problem. That way people can help you quicker and easier. Read below for asking questions.

Also, I would recommend learning data trees. copying and pasting code may seem easier but in the long run learning how to use the trees will help you tremendously. Arguably I think that learning about trees is probably the one of the most important things to learn first.
Grasshopper Masterclass with David Rutten - 01 - Overview of Data Trees on Vimeo (vimeopro.com)

Rhino Tutorials’s Videos on Vimeo