VBA Macro To Delete Rows/Columns, Insert Formulas & Auto Fill

I'm running a macro that opens another workbook and read data from it.How can I incorporate this code into my macro.Sorry i don't knwo VBA.

Workbooks.Open Filename:="C:Documents and SettingsmsimantbDesktopINFRACHEM_POLYMERS - DON''T DELETE.xls]Sheet1"

UserGRP_MAcro Macro
Rows("1:3").Select
Selection.Delete Shift:=xlUp
Columns("A:B").Select
Selection.Delete Shift:=xlToLeft
Columns("B:E").Select
Selection.Delete Shift:=xlToLeft
Columns("A:A").EntireColumn.AutoFit
Rows("2:2").Select
Selection.Delete Shift:=xlUp
Range("B1").Select
ActiveCell.FormulaR1C1 = "Existing userGroup"............................