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Yes—but in Crescendo this is not simply a visual “combine clefs” command. You need to consolidate the music from the two soprano/alto staves onto one treble staff and the music from the tenor/bass staves onto one bass staff, using separate voices where notes overlap, then remove the now-empty staves.
What to do
Make a backup of the score first, ideally by saving it under a new filename.
Keep one of the treble staves and one of the bass staves as the final grand-staff layout:
Usually keep the soprano treble staff and the bass staff.
The other treble and bass staves will be temporary source staves.
Copy the notes from the second treble staff into the treble staff you are keeping.
Where Soprano and Alto occur at different times, ordinary paste/copy may be sufficient.
Where they sound simultaneously, they must become separate rhythmic voices on the same staff rather than overwrite or turn into one chord incorrectly.
In conventional SATB notation, soprano notes normally have stems up and alto notes stems down on the treble staff.
Do the equivalent for tenor and bass on the retained bass staff.
Tenor is typically the upper voice in the bass staff, with stems up.
Bass is typically the lower voice, with stems down.
Use a tenor clef only if you specifically want that notation; most SATB piano-style reductions put both tenor and bass in bass clef, with tenor sounding an octave below written pitch when appropriate.
Check every measure for:
Correct rhythms and rests in each voice.
Simultaneous notes that should be independent voices rather than a single chord.
Ties, slurs, lyrics, dynamics, and voice/stem directions.
Playback, since merging notes can change how Crescendo interprets durations.
Delete the two emptied staves through Score → Parts and Staves (or the Parts Setup control on the Score toolbar). In that dialog, select the unwanted staff and use the delete control. Crescendo’s documentation confirms that the Parts and Staves dialog is where staves can be added, reordered, and deleted.nchsoftware
Important limitation
Crescendo’s documented staff-management tools describe adding, deleting, reordering, and linking staves, but do not describe an automatic command that merges the actual notation of two independent staves into one. A linked staff is not a solution here: it mirrors an existing staff rather than combining two separately written vocal lines.nchsoftware
So, if the music is already fully entered on four independent staves, the practical workflow is manual consolidation via copy/paste or re-entry into separate voices, followed by deletion of the empty source staves.
If readability is the goal
For a choir score, keeping SATB on four staves is often clearest. But if you want a compact keyboard/choral reduction, the conventional result is:
Final staff Voices placed there Usual stems Treble clef Soprano + Alto Soprano up; Alto down Bass clef Tenor + Bass Tenor up; Bass down
This leaves you with the familiar two-staff system while preserving all four vocal lines. Crescendo supports setting up, selecting, and removing standard staves from its Parts and Staves setup area.