Decomposition of one-to-one Associations is achieved through Association Blocks. On a Block Definition Diagram, an Association Block is a Block that is linked to a one-to-one Association through an Association Block Link. You can then decompose the one-to-one Association by creating an Internal Block Diagram for the Association Block.
For an example of Association decomposition, click here
To create a one-to-one association:
1. On the Block Definition Diagram's toolbar, click the Association button.
2. Click the start Block, and then click the end Block.
To link a block to a one-to-one association:
1. On the Block Definition Diagram's toolbar, click the Association Link button.
2. Click the one-to-one Association, and then click the Block that is to be an Association Block.
To populate missing association links on a block definition diagram:
Right-click the background of the diagram, point to Populate, point to Links, and then click Association Links.
To create an internal block diagram for an association block:
1. Right-click the Association Block, point to New, point to SysML, and then click Internal Block Diagram.
2. Type the name of the Internal Block Diagram, and then press the Enter key.
Note that you can open a Block's Internal Block Diagrams by right-clicking the Block, pointing to Open, and then clicking the appropriate command for the diagram you want to open.
To populate an internal block diagram with participant properties:
Right-click inside the diagram background or owning Block if shown, point to Populate, point to Nodes, and then click Participant Properties.
Association button.
Association Link button.