Unfortunately this link is not working.
But I can give a tip. If you have a separate MSSQL database backup you restore into Plesk.
You need just create this database and DB user within Plesk and restore content using osql.exe tool.
C:\Program Files\SWsoft\Plesk\admin\bin>osql -E
1> restore database mydb from disk = "c:\mydb.mssql.bkp" with replace;
2> go
Processed 80 pages for database 'mydb', file 'mydb' on file 1.
Processed 1 pages for database 'mydb', file 'mydb_log' on file 1.
RESTORE DATABASE successfully processed 81 pages in 0.047 seconds (13.987 MB/sec).
1>quit
Something like that.