We have customized Tally.ERP9 for Invoice entry and printing for Mobile Distributors, in which, the user can tag accessories along with the mobile, and while entering sale bill, the accessories will be selected automatically in the voucher, the rates of the accessories like charger and battery can be set in the mobile item, can be tracked from standard code, or from price list.

mobile distributor sales voucher entry

 

in the invoice printing, the breakup is shown as :

breakup of accessories in sales printing for mobile distributors and dealers