Reducing 3 measures of rests to one with a 3 above it

I have a score open with piano and violin. I select the violin part only and put the piano part "asleep".
In my violin score, I have 3 measures of rests. I want to reduce the three measures into one and have a 3 above the one rest. (I want the measure numbers to reflect the 3 measures of rest when the part continues.