Ed exemption under notification 6/2006

Respected Sir,

1]We have to supply the material to our immediate Customer who's Customer is Gas Thermal Power Project in Rajasthan.
2] Order says Excise duty is nil as per Excise notification 6-2006. End Customer is giving Exemption Certificate.
3]We don't have excise registration hence material will be supplied from our vendors who has mfg unit.
4]What documentation needs to be done? Excemption Certificate, CT1, ARE1 etc.?

Please Advice,