Exporting and Importing Themes
Note: This manual is for osCommerce v4.
After you accessed the admin area of your website click on Design and CMS and Themes tabs. Find the required theme and click on Backups button within it.
Click on Export button.
In order to import this theme click on Add Theme button. In the pop up window if you choose Empty Theme radio button you can import the theme by clicking on Import button as it is shown on the screenshot above. If you choose Upload from computer radio button you can import the theme by uploading the required zip file.