What if my component is not listed in your Profile drop down lists? Can I add any component or just those listed?

What if my component is not listed in your Profile drop down lists? Can I add any component or just those listed?

Frequently Asked Questions: 

You can add any component to a Profile. The drop down list is based on components that have an AD issued against them. If your component is not listed you can simply type it in the box.

The background will turn yellow to indicate a hand entered component. In the future when you open the profile simply look at each yellow entry to see if the component has been added to the list.