To Import MSSQL Databases in Plesk 10.x, please follow the following steps :-
1) Login to Plesk control panel.

3) Click on "Websites & Domains".

4) Click on "BackupManager".

5) Click on "Database Backup Repository".

6) Click on "Upload Backup File."
Note : You can upload only .bak file only.

7) Click on Browse to select the .bak file from your Local computer.

8) Click Ok.
