You can decompose Blocks by defining their specific features with properties. Block properties are used to capture the structural relationships and values of a Block. After the Blocks are defined in the SysML Block Definition Diagram, you can decompose each Block into:
Representing Block Properties in SysML Internal Block Diagram
You can represent Block properties in the SysML Internal Block Diagram in by using the Display Parts/Ports dialog, diagram toolbar, the shortcut menu, smart manipulator, drag-and-drop operation. All of those ways are described in the Displaying parts and ports page.
If you displayed nested properties, you can select their representation way. You can represent nested properties by displaying the property shape inside another property shape or by using dot notation. The detailed procedures how to work with property path notation, read in the Property path notation page.