Create a Combined Fragment

Step	Action	See also
1	Drag the Fragment element onto the diagram from the 'Interaction Elements' page of the Toolbox.	Combined Fragment
2	In the 'Type' field, click on the drop-down arrow and select one of the various types of interaction operator.	Interaction Operators
3	In the 'Condition' field, specify a condition or interaction constraint for each operand.
4	A rectangular frame displays, partitioned by lines into segments for each operand.
5	Adjust the frame to encompass the required event occurrences for each operand.

Notes

A message will always be contained within a fragment or a fragment operand when it is moved within it
Fragments on Sequence diagrams will resize when a message is moved down to ensure that messages, once within a fragment, always remain within the fragment