Is there any shortcut to merge/unmerge cells?

That is because there isn't one. But you can roll your own shortcuts for Merge Cells/Unmerge Cells.

In System Preferences : Keyboard panel : Shortcuts : App Shortcuts

1. Click the + box to add the Application shortcut
   1. Application : Pages
   2. Menu Title: Merge Cells
   3. Keyboard Shortcut: (type control m, it will image as ^M)
   4. Add
2. Click the Pages entry in the App Shortcuts, and click + again.
   1. Menu Title: Unmerge Cells
   2. Keyboard Shortcut: (type control+shift+m, it will image as ^⇧M)
   3. Add
3. Quit System Preferences

Back in Pages, after you extend your cell selection to merge with shift+right-arrow, you can now press control+M to merge them, and shift+control+M to unmerge the cells. Always be certain to refer to the existing keyboard shortcuts for Pages in its Help menu.

Fabulous!!!!!! Thank you!!!!!!!

Hello,

I tried the sme but merge & unmerge functions doesn't work.

Can you plx help me.

Same for me. Have you found a solution?