You can add new brands in OpenCart as follows:
1. Log into your OpenCart administration panel and go to Catalog -> Manufacturers from the main menu.
2. Click the “+” button.
3. Enter the required details for this brand.
4. To add a photo, click on the image button and then click the edit button .
5.Hit the Save button to save your changes.
Your new brand is now added.
If you want information on how to add categories to your product catalog, please take a look at this guide: http://www.guides.snipesoft.net.nz/opencart/how-to-add-new-categories/
Information on synchronizing your brands can be found in this guide: http://www.guides.snipesoft.net.nz/opencart/syncing-webstore-categories-from-opencart-to-omins/
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