If you need to share units in one project with another or you need to control some model elements in a configuration management system, you might need to divide the project into units.
Procedure
- Right‑click the element and then select Create Unit. The Unit Information window for the element opens with fields completed, as shown in the following figure:

- By default, the Store in separate file check box is selected.
- Edit the default Unit Filename, if wanted.IBM® Rational® Rhapsody® assigns the appropriate file extension for you in the next field. TheRational Rhapsody File Extension is displayed and cannot be changed if the unit must have a specific extension for Rational Rhapsody.
- You change the Directory for the new unit.
- In the access privileges radio button area, you might want to change the default Read/Write selection for the new unit to Read Only or External Reference.
- The Include in next load check box is automatically selected since you are adding a unit.
- Click OK.
Results
The unit in the browser is now marked with a small red icon. Save the unit and the icon turns black.