To create an accelerando/ritardando, proceed as follows:
Procedure
Select the notes as described above and select “Accelerando” from the Group/Ungroup submenu.
A dialog appears.
Use the radio buttons to select the desired combination (i. e. define whether you want an accelerando or a ritardando and specify the desired note values) and click OK to close the dialog.
Figure: Example for accelerando (left) and ritardando (right)
Double-clicking on the “Grouping” text opens the Grouping dialog, allowing you to select another combination.