Create area boundary lines from links


I’m new to dynamo a first time user and currently working on a large retail project.
what I’m look for is to creating leasing plans using area boundary lines. My main model has linked models so i would like to copy walls from links and create boundary lines after lines have been created i want to delete the walls created this is what i have so far any help would be appreciated.

Start with an area plan, floorplans wont let you create Area Boundaries i think