Select the one cell and copy. Select the whole table (most easily by
clicking the little square box that floats just outside the table's upper
left corner; or choose Table > Select > Table) and paste. All the cells will
fill with copies of the first cell.

An alternative is to select the first cell and insert a bookmark. Then put
the cursor in another cell and insert a cross-reference to the first cell.
Copy the cross-reference and paste it into the other cells. This has the
advantage that if you edit the first cell, you can just select the whole
table and press F9 to update all the cross-references.

Eric,

See:
http://www.gmayor.com/graphics_on_labels.htm