Yes you can. Retail stores are often certified by department, such as produce, meat, bulk foods, prepared foods, etc. Any or all departments can be certified.
No, retail stores are not required to be certified. But they can choose to be in order to provide assurance to customers and go the extra mile to ensure that organic product integrity is maintained.
Yes you can. You will need to maintain the organic integrity of the ingredients and products by preventing commingling and contamination of organic products with any prohibited materials, such as sanitizers, pesticides, and non-organic products or ingredients. Additionally, you will need to clearly distinguish organic products from non-organic products to provide accurate information to your customers via labeling or signage.