I have a dump file of database backup(openerp-7). Now I want to continue my work in Odoo, the database is in openerp-7 format so I am not able to restore it in Odoo. How to convert this database to Odoo version in order to start working on it?
You must do a data migration. That's not an easy task. You can use some of this migration tools:
Or you can use some ETL tool such as Odoo ETL
If you only want migrate some table you can export it in a CSV file and import it in Odoo choosing the right columns.