Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   Clipbrd;

 //Copy 
procedure TForm1.Button1Click(Sender: TObject);
 var
   S: string;
   GRect: TGridRect;
   C, R: Integer;
 begin
   GRect := StringGrid1.Selection;
   S  := '';
   for R := GRect.Top to GRect.Bottom do
   begin
     for C := GRect.Left to GRect.Right do
     begin
       if C = GRect.Right then  S := S + (StringGrid1.Cells[C, R])
       else
         S := S + StringGrid1.Cells[C, R] + #9;
     end;
     S := S + #13#10;
 end;
   ClipBoard.AsText := S;
 end;

 // Paste 
procedure TForm1.Button2Click(Sender: TObject);
 var
   Grect: TGridRect;
   S, CS, F: string;
   L, R, C: Byte;
 begin
   GRect := StringGrid1.Selection;
   L := GRect.Left;
   R := GRect.Top;
   S := ClipBoard.AsText;
   R := R - 1;
   while Pos(#13, S) > 0 do
   begin
     R  := R + 1;
     C  := L - 1;
     CS := Copy(S, 1,Pos(#13, S));
     while Pos(#9, CS) > 0 do
     begin
       C := C + 1;
       if (C <= StringGrid1.ColCount - 1) and (R <= StringGrid1.RowCount - 1) then
         StringGrid1.Cells[C, R] := Copy(CS, 1,Pos(#9, CS) - 1);
       F := Copy(CS, 1,Pos(#9, CS) - 1);
       Delete(CS, 1,Pos(#9, CS));
     end;
     if (C <= StringGrid1.ColCount - 1) and (R <= StringGrid1.RowCount - 1) then
       StringGrid1.Cells[C + 1,R] := Copy(CS, 1,Pos(#13, CS) - 1);
     Delete(S, 1,Pos(#13, S));
     if Copy(S, 1,1) = #10 then
       Delete(S, 1,1);
   end;
 end;