To create an SCA assembly file:
Right-click the project and select New > Other.
In the New wizard, select SCA Composite in the SCA folder and click Next.
Type a unique name for the composite in the File name field, select a folder.
Select the SCA specification you want to use.
If you also want to edit the composite in a graphical way, select Create a diagram file. Notice that this option may be disabled if it is not supported for the selected SCA specification.
Eventually, click Finish.