How to add space in between columns in VI editor

UNIX HP-UX
1

Hi,
I am trying to add space after 3rd and 6th column for editing a file in special format. How should I achieve in VI?. So, is it possible to do in it in sed ?

thanks
vipa

2

it can be done in either, but would be more easily acomplished with awk:

awk '$3=$3" ";$6=$6" " { print $0 }' file