Opencart additional changes

Hi, I have OpenCart website ([login to view URL]), which required few changes: 1. Sidebar menu only show two levels. If you will go to Baby Room/Baby Care Range then on the right window two of sub-categories (Black & White Baby Care Range and Multi-Coloured Baby Care Range) are not shown on sidebar menu. 2. On the product window for example here ([login to view URL];product_id=62) I need to add 3 tables: - first need to contain age group of the product - Second where I could list to which safety regulation this product is complying to - Third material we’ve used and how to care about it And I need to be able to change it in administration panel 3. Instead of dimension that are already in OpenCart I would like to change it to the frame where I could write them manually rather then stick only D H L. Sometime I will have to put Radius instead of D and L. 4. On the product window next to bookmark Description and Review I would like to have an option to add Related Product bookmark and Additional Product bookmark.