can we Implement existing Non-BOPF application in BOPF framework ???

Existing ABAP application tables  doesn't have DB key , Root key and Parent Keys so
1. if i create new table with these keys then
2. how can i get that already existing data of old application to new BOPF application ???
3. if i create data entry in new application should i replicate same data in old tables also???:

Example : SD module applications