Best way to copy data only from one database to another

I've created a database copy on our development server from a live database on our production server by doing a SQL backup and restore. I've done some work on the development server copy database by adding tables, stored procedures etc. As time's gone on though, the data on the development server is quite out of date. What's the best way of refreshing the data on the development server from the live server without losing any of my new database objects? It's only the table data I want to refresh by the way. Nothing else like stored procedures etc. as I've amended of these as well as creating new ones.