# 1/7 Defining Main Shell | CATIA V6 - 3D EXPERIENCE Functional Part Design Tutorial
In this video series we will go through basic functional part design steps.
In the first video, you will create a shellable prism from a profile sketched in the Sketcher workbench with the shellable feature command.
Creating a shellable prism means ensuring that the geometry you are going to create can be shelled after you added material generated by other feature.
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Link for the part model:
https://drive.google.com/file/d/11bg7...