If you have some data that exists only in Streamline but not in your QBO account, you can choose to export it to QBO. If data exists in both Streamline and QBO, check Pairing Data between Streamline and QBO.
Streamline allows exporting of various types of data, all of which will be explained separately in the following sections.
Before you export any type of data, make sure that you have completed the setup for connecting QBO and Streamline, explained HERE.