Unfortunately, we don't have a direct feature for sorting the list. However, there is a workaround explained below.

Workaround

Step 1 - Enter your price list and press the backup button located at the bottom of the list.
Step 2 - After you press the backup button, your browser will download a backup of your price list (it'll be downloaded as a JSON file). 
Step 3 - You may then be able to use an online tool to sort the data in the JSON file,
Step 4 -  Edit any current price list, scroll to the bottom and press the 'restore' button. 
Step 5 - Load the sorted file you saved from the website that had the JSON tool.

JSON Tools

https://novicelab.org/jsonabc/
https://codeshack.io/json-sorter/