is possible user can choose multiply pay file in every post?
i explain more than. i have an circuit electronic shop,i have a produce "caller id"
this produce is 4 part:schematic,source,PCB,PDF datasheet
every part have a value pricing
PDF datasheet =12$
so may be a user only want pay PDF ,may be another want buy PDF and schematic together ,and 3th user like buy all of them
i add variable pricing but in this feather user can only choice one of them
i want a check box that user can choose for every file he need for exam PDF file and source to pay that