o Go to Insert | Fields > | Other... (or Ctrl+F2).
o Select "Set variable" and give your variable a name.
o Under Format, select Text and enter your original value for Value.
o If you prefer, you can suppress the appearance of your text at this point in the document by ticking Invisible.
o Insert.
o Close.
Each time you need to insert the text:
o Go to Insert | Fields > | Other... (or Ctrl+F2).
o Select "Show variable" and your named variable.
o Insert.
o Close.
When you need to change the text:
o Put the cursor just to the left of the *original* field. (If you chose "Invisible", this will be a small, apparently empty field shading.)
o Go to Edit | Fields... (or right-click | Fields...).
o Select your named variable.
o Modify the text under Value.
o OK.
Voilà!
There is no particular need for this value to be in a table cell where it appears.
I trust this helps.
Brian Barker