I have three questions

1. How do you remove the 'sit' option from the pie menu of an object?
2. How do you rez a object at a target?
3. How do you use a script to delet an object?

Well, you can *change* it with llSetSitText()... probably if you make it blank, it will be blank in the pie menu (which isn't the same as being greyed-out).llRezObject or llRezAtRoot... or, if the target is more than 10m away, one of those plus a warpPos.llDie().

but how do I get it greyed out?

You probably can't.

You could put a script in there to unsit anyone as soon as they sit on the object though.

-Atashi

you CAN make it impossible to sit on a prim by automatically unsitting anything from it.

vaguely like that:

changed(){
//check if the change is an avatar sitting on the prim
llUnsit
}

if the linkset changes number of prims, you'll want to set a sit target, and test with

llSitTarget( ZERO_VECTOR, ZERO_ROTATION ); //-- this line goes in default state_entry

changed( integer vBitChanges ){
  if (llAvatarOnSitTarget()){
    key vKeyLast; = llGetLinkKey( llGetNumberOfPrims() );
    while (llGetAgentSize( vKeyLast = llGetLinkKey( llGetNumberOfPrims() ) ) != ZERO_VECTOR){
      llUnSit( vKeyLast );
    }
  }
}

if not then use

changed( integer vBitChanges ){
  if (CHANGED_LINK & vBitChanges){
    key vKeyLast; = llGetLinkKey( llGetNumberOfPrims() );
    while (llGetAgentSize( vKeyLast = llGetLinkKey( llGetNumberOfPrims() ) ) != ZERO_VECTOR){
      llUnSit( vKeyLast );
    }
  }
}

those will pick up multiple sits at once, while you're in other code proccesing

OK I tried those scripts, maybe I'm doing something wrong but you can still select "Sit Here" from the pie menu

Yes. What they are saing is that you cannot disable that. The best you can do is make it ineffective by shoving avatars back off after they have sat. You can also change the default left-click action so they have to do it through the pie menu, and change the text to say something different. You could also set the sit target to some odd location so when they are unseated they aren't in an inconvenient location (or llSetPrimitiveParams() after the fact, but you can find plenty about that in other threads at the moment).

Oh, OK, Thank you all for your time.