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1.  Create a scheduled task use the executable CSVDE (http://technet.microsoft.com/en-us/library/cc772704.aspx).    This utility is designed to export your data from AD into a CSV file.
          Here is an example for the syntax to run CSVDE: 
                      csvde.exe -f user.csv -j c:\test -r "(&(objectClass=user)(manager=CN=*))"
      In the Scheduled task set the time you want the it to run.
 
2.   Create a CSV File Data source that will use the file created from CSVDE.

3.       On the Data Source enable Import data pre-processing function.  Below is sample code you can use for your script;
                    //add new column for parsed data
                        importData.Columns.Add("myManager", typeof(System.String));
                        importData.AcceptChanges();
                  //iterate over rows in importData collection
                        foreach (DataRow row in importData.Rows)
                       {
                                  //create dummy string
                                      string t = row["manager"].ToString();
                                 //create string array of manager dn, split on comma
                                      string[] a = t.Split(',');
                                //assign first array member to dummy string
                                      string manager = a[0];
                                //assign parsed data, minus 'CN=', to newmanager field in row
                                       row["myManager"] = manager.Substring(3,manager.Length-3);
                       }
                return importData;

4.       Create an Import/Export rule that will use the CSV file Data Source.
            Here you will map the columns to the data classes and also then you will schedule the rule to run.  FYI – You will want to do it sometime after the CSV file is created.