Rules for using trade mark

I want to know if a company who is registered in central excise and manufacturing product A in brand name say helium

-- Can this company do trading of other products which are not manufactured by them in the same brand name helium

-- Can this company sell right to use brand name helium to other company/trading firm

-- or can a trading firm purchase the right of brand name helium from central excise registered company and sell other produts in this brand name.