\definenarrower[Common][left=3cm,right=3cm]
\definenarrower[One][Common][default=right]
\definenarrower[Two][Common][default=left]

\setuplayout
  [backspace=1cm,
   width=middle,
   topspace=1cm,
   height=middle,
   footer=0cm,
   header=0cm]

\setupbodyfont
  [10pt]

\setupwhitespace
  [big]

\starttext

    \startOne
        \input ward
    \stopOne

    \startTwo
        \input ward
    \stopTwo

\stoptext
