[Karan007]

if(!strcmp(cmdtext, "/enter", true))
{
if(IsPlayerInRangeOfPoint(playerid, 3.0, FLOAT:X,FLOAT:Y,FLOAT:Z))
{
SetPlayerPos(playerid, FLOAT:X,FLOAT:Y,FLOAT:Z);
SetPlayerInterior(playerid, [Add Your Interior Here!]);
}
}
if(!strcmp(cmdtext, "/exit", true))
{
if(IsPlayerInRangeOfPoint(playerid, 3.0, FLOAT:X,FLOAT:Y,FLOAT:Z))
{
SetPlayerPos(playerid, FLOAT:X,FLOAT:Y,FLOAT:Z);
SetPlayerInterior(playerid, [Add Your Interior Here]);
}
}

Go In-Game Do /save Where You Want To Make Limit When They Do /Enter Then They Will Enter And Same To The Exit. And Don't Forget To Add Your Interior!And Add It Under The Callback OnPlayerCommandText.