You can create new constants and use them in multiple patterns.
Procedure
Open a model transformation pattern.
Click Properties on the button bar if the Properties bar is not activated yet.
Click Add constant, and click the modeling area of the Mapping bar.
Model the connections you need and save them.
After you saved them, the new constant is displayed on the Constants tab in the Properties bar.
Tip
You can drag constants to the modeling area of the Mapping bar using drag and drop.