Deleting Items From Array

I have a multiplayer asteroids game that I've been working on for a little while. The multiplayer works and I can see the other players etc. But I'm having a few problems with arrays. How do I delete an item from an array? I've solved this so far by making a simple 1d array and then allocating space for the bullets based on flags. like this: 0 <-- unallocated space. 0 0 0 1 <--- allocated space 1234 5678 123

DEF ALLOCATE B,X,Y,A OUT DID
 VAR I=0
 WHILE I < LEN(B)
  IF B[I] == 0 THEN
   B[I+1]=X
   B[I+2]=Y
   B[I+3]=A
   RETURN TRUE
  ENDIF
  INC I,4
 WEND
 RETURN FALSE
END

The code then loops through the array and tries to assign a bullet to some unallocated space. This works well when there are only a small amount of bullets on screen right now I'm using an array with 64*4 indexes. But it will stop working when more than 64 bullets are on screen. How instead do I delete an item from the array at any index? This would solve my need for an allocation function and make my code much cleaner.