So in the page, there is:
Appendages
Armor
Attacks
Barriers
Clothing
Defenses
Duplicates
Elements
Entities
Environments
Objects
Platforms
Portals
Restraints
Structure
Support
System
Technology
Vehicles
Weapons
For example if you chose clothing, you cannot create buildings or vehicles and only limited to clothing. You can see what you can create in the page.
