how to get data using array concept

HI,

we have a client requirement to capture createtime,lastupdatetime,shortdescription,longdescription fields data for each Promotion from my response to a external source.so this Promotion depends upon configuration setting-its not like always 1 promotion, may be 2 or 3 for each request,depends upon the req/scnerio.below is my response.please suggest how to capture this all data by using Array concept.If 1 Promotion then i used that Datasource/sink concept and extract to my excel sheet but if more than1 promotion then this is not the right approch.

attached response for your references.