Using Custom Tasks in Custom Packages 
From the Microsoft SQL Server Business Intelligence Developer Studio, open the Microsoft SSIS folder.
Create a new package, or select an existing package to modify.
Choose .
In the Task Location field, browse for the target .dll file.
Note
By default, the .dll files are stored in BPC/Websrvr/bin.
Enter a task description, select an appropriate icon, then click OK.
Drag the icon to the designer window. Enter data as required.
Save the package.