Few amendments in Opencart

Hi, I have OpenCart website (temp.activelearning-uk.com), 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
(http://temp.activelearning-uk.com/index.php?route=product/product&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.