The "Place Component" command in Autodesk Inventor only allows you to place a single component at a time. Therefore, it can be a tedious and time-consuming operation when you have multiple components to insert. As a workaround, launch Windows Explorer but adjust it so that you can see your assembly window in the background.
Navigate in Windows Explorer to a folder within your project and select the components that you would like to place using the CTRL and SHIFT keys. With the components selected, click and drag from Windows Explorer into the assembly window which should be partially visible in the background.
Click on the image to see a larger popup window showing this process.
Note: Since the first component in every assembly becomes the grounded component, I will typically insert this first component using the traditional "Place Component" command and then use the method above to quickly place the remaining components.