How can I edit the Menu pattern in Left Menu?

How can I edit the Menu pattern in Left Menu?

Also ...
1. admintool/listcategorii.php
Problem : All the Categories and Sub Categories are listed together in
this page which make a mess and lengthy page.
Suggestion : Can we have Categories and Sub Categories on different
Pages when you add Categories or Modify categories page?.

2.admintool/editcategorie.php or modifycategorie.php
Problem : "Order in Menu" is something confusing, or we have to
remember to avoid conflicts.
Suggestion : Can we have A DROP DOWN menu here with an option to
choose the number automatically?

3. Can we have SUBCATEGORIES UNDER THE SUBCATEGORIES AGAIN?
It is possible to add, in the menu and I did add one like that, it
doesn't display on LEFT MENU.
http://www.domain.com/admintool/adproduct.php?action=form
Even if you add a product like that, with this menu, you will get only
Categories, and sub categories, but never sub categories within
subcategories.

4. Problem: Item Number:
Suggestion : Is there any way you can automatically generate the item
number once you give a vendor ID for ex: Grafix software ( GSxxxxxx) I
mean, GS followed by automatic numbers?

5.

How can I edit the Menu pattern in Left Menu?

Open template_left_menu.html and template_left_menu_subcat.html.
This 2 file need to be edited, but be carefull about the hidden elements.
This hidden elements should not be deleted.
<!-- BEGIN DYNAMIC BLOCK: row -->
<!-- END DYNAMIC BLOCK: row -->

For question 1 and 2, we are working on this.

3. SUB-SUB categories are not allowed yet.

4. NO, cannot, item number is different for all people, can be SKU, personal ID for products etc.