thanks to all for yout tips...

...but i've found on my own the solution i was lookin for.

just 3 lines of code and a magical word: "Workbooks"

this is the macro i wanted to implement

Sub copiaform_da_MytyM2_a_MytyM()
'
' copiaform_da_MytyM2_a_MytyM Macro
' Macro registrata il 19/10/2005 da fulvio
Dim i As Integer

For i = 15 To 123 Step 12

Workbooks("My.T.y.M.xls").Worksheets("saved line-ups").Range("B" &
i).Value = Workbooks("My.T.y.M2.xls").Worksheets_("saved
line-ups").Range("B" & i).Value

Workbooks("My.T.y.M.xls").Worksheets("saved line-ups").Range("C" & i +
1 & ":C" & i + 11).Value =
Workbooks_("My.T.y.M2.xls").Worksheets("saved line-ups").Range("C" & i
+ 1 & ":C" & i + 11).Value

Workbooks("My.T.y.M.xls").Worksheets("saved line-ups").Range("E" & i +
1 & ":E" & i + 11).Value =
Workbooks_("My.T.y.M2.xls").Worksheets("saved line-ups").Range("E" & i
+ 1 & ":E" & i + 11).Value

Next i

End Sub