im not sure the exact way you'd go about it in fruity as i havent used the programme for a long time now but if i were to do it in cubase i'd create a group channel and send any channels i wanted to effect with the stutter into that group, then to generate the stutter effect either automate the master volume of the group though midi on/off notes or you could insert a slicer/chopper or some other volume effecting vst effect into the group then automate it on or off for when you wanted the effect to start - end

or in a similar way just automate the master volume of each individual layer you want to stutter in the automation lane, you could alternate the volume patterns then and get some rhythmic chopping going with different layers building up a kind of volume driven groove ?