Hesro,
You are creating a single family (one name) of 13 breps and placing it once, please look at how list and tree structures work in Grasshopper.
There are many ways to approach this, which one is optimal depends on your workflow requirements.
One way is to graft your Breps and place as Add Geometry Direct Shapes.
If you need need a single family you will need to Create in Revit and change the sizes via parameter.
If you want multiple families you would need 13 names and 13 locations for your breps.
Feel free to ask questions, but do note that it’s the weekend and responses won’t be immediate.
See this example below.