Hi bengtssjan,
Welcome to the Sony Community!
When you say that you want to import the AVCHD videos to PlayMemories Home, may I ask if they're saved in a different file folder other than your default picture folder? If they are, you can add the folder to PlayMemories Home so that the program will also manage it and display the files saved in it. Please click on this link for the step by step guide on how to add folders to PMH.
There is no need to copy the files back to the media card to import them back to your computer. If you want to import files to your computer using PMH, you can insert the card to the card slot of your computer and open the program to do so. If your camera is compatible with the OS of your computer for USB transfer, simply connect the unit to the port of the computer and turn it on. PMH will open automatically once the computer detects the connection.
For further assistance, we recommend contacting your local Sony support team. Please visit our Sony Global Web site, http://www.sony.net/SonyInfo/Support/, for information on contacting the Sony Support Center in your region.
If my post answers your question, please mark it as "Accept as Solution". Thanks_Mitch
