you mean you want to know where the right most portion of a word ends based on the length of the word, correct?
The field size does not change so it is not the postion of the field but a position within the field.
you would actually be overlaying your two fields to get them side by side
you will have to calculate postion X to move left as:
(-1) *
(
(starting postion of right field in twips)
-
(starting positon of the left field in twips + the length of the word in twips)
)
to get the length in twips I would make a guess at the size of each character and multiply that by the len(field)
the size of each character will vary based on font type, size , bold etc.
but make a guess and move it up or down a bit until you get it right