You need to use SRM Import Export console to export SRD,PDT from one server to other.
You need to have SRM Administrator permission to access SRM Import Export Console.
Following steps need to be followed:
a) Login to SRM Import Export Console on source server.
b) Search for SRD which you have created.
c) Export SRD which you have searched alongwith supporting data. The supporting data will involve questions, app target data, target data assosiations, variables, variable mapping etc along with pdt and aot.
d) The exported data will be transferred as .arx file.
e) Login to destination server and open SRM Import Export Console.