After installing Export Content Component you will have the option of compiling the site content by selected section(s) and all content within the selected section(s).
Note: There is an option to have all static content compiled with any section(s) selected
To make things a bit clearer I have put together a few screen shots of the process.
Transfer Content Screen Shots (from earlier version)
Once you have compiled the selected content from the source site and installed it via the site installer at the destination site you will have the option of transferring the data by:
+ Single or multiple section(s) and all the categories and content contained in them.
+Single or multiple categories and all the content contained in them.
Screen Shots 
