Excise credit on opening stock

Dear All,

Please clarify me on the following queries 

1. Union budget has annouounced excise duty on branded garments. Whether excise duty  would be applicable goods cleared after 1st march against previous maonth stock (before ist March) also . If it is applicable ,whether we can get credit against stock .

2.if the manufacturer doing both branded garments of own and others, whethet we can claim ssi exemption for own brand.

3.For ssi exemption , clearance value will be calculated form which period. Form 1st april 2010 or 1 st March 2011

Thanks

Arul Murugan.M