sure can, just copy the same flight plan depending on how many AC you want up in the air.
They all have to have the same cruising speed though.
this is how the flight plans look
AC#5,136,50%,1Hr,IFR,00:55:44,01:30:10,070,F,0136,KFMH,01:45:40,01:20:06,080,F,0
136,KBTV
AC#6,165,50%,1Hr,IFR,00:55:44,01:30:10,070,F,0165,KFMH,01:45:40,01:20:06,080,F,0
165,KBTV
AC#7,102,50%,1Hr,IFR,00:55:44,01:30:10,070,R,0102,KFMH,01:45:40,01:20:06,080,R,0
102,KBTV
AC#8,100,50%,1Hr,IFR,00:55:44,01:30:10,070,F,0100,KFMH,01:45:40,01:20:06,080,F,0
100,KBTV