There is a good preliminary documentation on building Report Parts in MSDN:
Publishing Report Parts in Report Builder 3.0 – http://msdn.microsoft.com/en-us/library/ee633670%28v=SQL.105%29.aspx.

Creating the Report

Download document/screenshots: Exploring SSRS 2008 R2 Report Builder 3.0 – Report Parts

For this mini tutorial I am going to assume you have created your report in BIDS 2008

1. Deploy your report to the report server.

2. Go to that report. Hover over the report name, and click on the down arrow to reveal the contextual dropdown. Select Edit in Report Builder.



3. Once Report Builder opens, go to the Report Builder main button (I think it looks like a scroll), and select Publish Report Parts.



4. In the Publish Report Parts window, select Review and modify report parts before publishing (unless you really want to publish all report parts with default settings).



5. In the next window, select which Report Parts you want to publish. Put a description too, makes it easier for your Report Builder users to identify report parts later on.



6. When you’re done, click on Publish. Note there is no dialog box notifying you that publishing is done. All you get are the green checkmarks beside the report parts you selected, and the message at the bottom of the Publish Report Parts dialog box saying how many report parts were published, and how manyfailded.



7. If this is the first time you published a Report Part, a new Report Part folder will be created in your report server.



8. Inside the Report Part folder are your published report parts. Note that the icon of the report parts give it away – puzzle pieces! Also note that when you hover over a report part and click on the down arrow, you will reveal the contextual menu for a report part (move, delete, security, manage and download).



That’s it. Great job.

Report Part Gallery

Inside the Report Builder 3.0, you will also see the Report Part Gallery tab, which will list all available Report Parts you can add to your report.



Report Part Updates

It is also important to note that if any report parts get updated, the reports that use that report part will display a notice when opened in Report Builder. It will tell you that the published report part(s) have been updated on the server.



Once you choose to view changes, you can select which report parts you want to update.



And once it’s updated, no in-your-face notice again that the update was successful. It’s still just that subtle green checkmark beside the report part you chose to update.



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