Accountiong on consolidation AS 21

Hi,

Can any body throw light on the following.

Whether subsidiary or  majority board controlled  company's accounts are to be
consolidated  with the holding co's accounts from the date of parent subsidiary
relationship exists or from the statrting period of accouting period of subsidiary company  irrespective  of  the date of becoming subsidiary co. If it is to be consolidated from the  date of subsidiary relationship starts, how to consolidate.

1. The relevant sales and cost of sales and other exps -- how to conoslidate.

2.  Balance sheet is with reference to closing date say March.31 in which case
     it may include items prior to subsidiary relations comes>

   What will be the accounting traetment for sales and exps prior to the period
    parent - subsidiary relationship.

  Could some one clarify?

  Thanks

 Mouli