Registration works on a compilation unit basis, so if you create several components in a single compilation unit, you can register them all at once. 

To register a component, add a Register procedure to the unit. Within the Register procedure, you register the components and determine where to install them on the Tool palette.

in the IDE, the code required to register your component is added automatically. The steps for manually registering a component are:

• Declaring the Register procedure
• Writing the Register procedure