Category Description (number) calculate

I have a Wordpress installation for a restaurant, with a menu (food) with numbers.

The menu (food) numbers dosn't go from 1-50 continuously but starts with the next 5 like this:

Lunch offers: 1-4

Chicken sticks: 10-13

Chicken wings: 15-17

Salads: 20-23

This is made, so it's easy to add something within the different categories without the following menues would have to change the number.

However, this is very hard开发者_Python百科 (for me at least) to make.

My solution is to give every category a number, in the description, and then add this number to the childs number of the category.

Ex.: Lunch offers (categoryDesc. = 1)

- (menuNumber = categoryDesc + ChildNo) Burger (childNo = 1)

- (menuNumber = categoryDesc + ChildNo) Chicken (childNo = 2)

- (menuNumber = categoryDesc + ChildNo) Salad (childNo = 3)

Does it make sense? If so, how do I achieve this?

Thank you in advance...

The solution is to make the list with ordered lists (OL) and then start the OL's with the number you want to.

<ol start="5">
    <li>This is number 5</li>
    <li>This is number 6</li>
    <li>This is number 7</li>
</ol>

That's the way I did it.