Query- are 1

if the supplier is registered under excise, then ARE1 is required.

First you shall get CT-1 from your range office and handover the same to your supplier.  Based on CT-1, Supplier will not charge excise duty in his invoice.  After bringing the material, you shall raise ARE-2 and can export the same.  If you want to export the goods from supplier premises, you can raise ARE-2 after giving intimation to the excise authorities.  you need not give ARE copies to the supplier.