Applying the shipping cost to the final price has never been easier with the new advance auto-repricing tool.
1 - Select the supplier for your repricing rule (each supplier has its own repricing rule)

2 - Check the "Add Shipping Cost" box to enable the shipping calculation for each rule

3 - Click "Save & Apply Rules" to make these rules active.

The shipping cost is calculated based on a single destination that you can choose by clicking on the Configuration link

and selecting the default destination country from this dropdown

Please note: While most of the merchants ship mainly to a single country you could need to ship worldwide or to a subset of countries.
At the moment this tool is not ready to calculate several countries shipping costs at the time but we are working to make this possible.