Hi Kiran,
You can find below screen shot of multi repository configuration.
You need to configure like below (SID = XI_IDOC_DEFAULT_DESTINATION_SID)
CRD=XI_IDOC_DEFAULT_DESTINATION_CRD;EWD=XI_IDOC_DEFAULT_DESTINATION_EWD;E6D=XI_IDOC_DEFAULT_DESTINATION_E6D;
And you need to create all of the above RFC destinations in NWA destinations which are pointing to respective systems.
Regards,
Praveen.