synchronize two webform select options In my webform page I have two select options components:

Item number:
20 | 20 ,
35 | 35 ,
40 | 40

Price List:
100 | 100 ,
200 | 200 ,
300 | 300

I need these two select options components synchronized. If one selects Item number (35) the price list also moves to (200).

Is there any module available to do that, or how can I get the synchronization of the two select options.
I do not need to synchronize, but combine (merge) them in one list. 
In Webform Views Select  I can also combine by using Rewrite Results, 

field "Item Number", exclude from display

field "Price List", 
Rewrite Result:
[value] - price [value_1]

Then I can get in a single select option list: 
20 - price 100
35 - price 200
40 - price 300