Try $gettok. For example:
$gettok($read(Sampletxt.txt,3),N,32)
returns the Nth word. You can also use a range for N (example, 1-4 or even just 1-) just as you can with $1-. As for the meaning of the 32, it is the ascii value of space, which is the character that seperates the tokens in this case.
Alternatively, you can /tokenize 32 <line of text> to fill the $1- with your text