how i integrate product filter like brand, price colour etc?

Hello pradeepnambyan, Thank you for your question. In OpenCart you can setup categories to group products together, here is our guide on adding product categories. You can also add manufacturers to your Opencart store, and then choose the manufacturer when you add a new product. Adding attributes to products can help when searching as well. Alternately, there are many plugins available that can simplify the setup of filters, you can locate them by searching for Filter, in the official Opencart site. If you have any further questions, feel free to post them below. Thank you, -John-Paul