1)Login to Plesk control panel.

2)Click on Subscriptions.

3)Click on subscription name.

4)Click on Database tab.

5)Bellow the database click on Show More option

6)Click on Import Dump.

7)Select the file which you want to import.(You can select file from your local computer or from plesk httpdocs) and then click OK.

8)At the bellow right hand side you can see the information that task started.

9)Here you can see the information that Dump was imported.