AmeriCommerce V2 themes are able to be Exported from one site and imported into another. This will allow for the ability to share themes with the communtiy, etc.
To import the theme you'll need to the Theme's Exported .ZIP file generated by AmeriCommerce.
First go to Themes > Import Existing Theme
Give your new Theme a Name and then click the File Browse Icon to select your .ZIP file.
First Click on the Upload Files tab, Select your file from your computer, Click a Destination (the Destination is not important as long as you remember what it is. The file browser will default to /images so that would be fine) on the right panel and click Upload.
Once the .ZIP file has uploaded click back to the Server Files tab. Select the folder from the left and the file on the right, then Click Insert. The original Import popup will show again with the uploaded file selected. Click Save.
You will then be taken to the Theme Editor for your newly imported theme.