Let's say you want to augment the SysML Requirements diagram pallet by adding three new buttons for DSL element types: one – for the User Needs element type, other – for the System Requirement element type, and another – for the Component Requirement element type.
Open for edit the customization profile.
Create a Profile diagram or just open an existing one.
Create a customization.
Set the custom element type as the customization target.
How can I simply set the customization target?
Drag the DSL element type to the shape of the newly created customization element.
Create the Place on Diagram Pallet property Open the Specification window of the customization and click Attributes on the left side