I've never done a if then else statement, if someone can help me out it would be much appreciated !!

If @add and LOC <=5 then
{
     If Loc ="1" Then @xpost(@Fn,Part Number,"Mastinv!Itemnumber",Qty,"PHA1","Sub")
        
      elseIf Loc = "2"
     
     @xpost(@Fn,Part Number,"Mastinv!Itemnumber",Qty,"PHA2","Sub")

     elseIf Loc = "3"

     @xpost(@Fn,Part Number,"Mastinv!Itemnumber",Qty,"PHA3","Sub")

     elseIf Loc = "4"

     @xpost(@Fn,Part Number,"Mastinv!Itemnumber",Qty,"Vict","Sub")

     Else @Msg("Ops I goofed")

}

You can, and probably should use the if.. then..else construct. The problem in the first example is that there is no keyword: "elseif" - there is a keyword "else" and a keyword "if". To produce an "else if" you need the space between the "else" and the "if" (i.e.: "else if"):

if(aa = 1)
{
  writeln("One")
}
else if(aa = 2)
{
  writeln("Two")
}
else if(aa = 3)
{
  writeln("Three")
}
else
{
  writeln("Not one, two, or three")
}