Karan,
What I understood from this thread is like, your requirement is to reload the sales orders back to your database that you have already archived.( Please correct me if I am wrong).
For reloading SAP has provided a reload program S3VBAKRL, you can use below link for understanding variant for reload program.
Reloading sales documents is not provided for in the standard system and is therefore also not available in archiving management (transaction SARA). Reloading should only be carried out in an emergency, for example , when the wrong document has been selected. Enter the program name into the Customizing view for transaction AOBJ for object SD_VBAK.
CAUTION: When reloading sales documents, the corresponding CO data is not simultaneously reloaded into the system. Therefore, you should reload sales documents only in case of emergency, for example, if documents were wrongly selected.
I hope that helps.
Regards
AG