for example if i kept the array in L3

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Lbl bullets
return!if {L3}r //L3r will have the number of bullets currently in play, so quit routine if no bullets
L3+2->F //F will keep track of the current array pointer
{L3}r+1
while -1->E

{F+2}r+{F+4}r -> {F+2}r   //update bullet x, if bullet x is kept in index+2 and xvel is kept in index+4
If (bullet on screen)
Pt-On(plaX-{F+2}r,{F+6}r,{F}r*8+pic0)  //draw bullets, assume buly is in index+6 and bullet type is in index+0
end
F+8->F  //move to next bullet
E
end

YOu have a struct like this:

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typedef struct{
  unsigned short x;
  unsigned short y;
  short xvel;
  short yvel;
}Bullet;
And you can init it like this:

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Bullet bul = {.x = 20, .y = 35, .xvel = 2, .yvel = 3};

YOu can later add things like type id, lifetime, or whatever you want!
And adding xvel and yvel to the bullet:

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bul.x += bul.xvel;
bul.y += bul.yvel;