When you print price tags for an order, it prints for all the items in the order. But if you need only to print price tags for certain items you can do it as follow;
Go to Item List (Select the cog > Item > Item Details)
In the item list there is an option "Tag Suppress Print". You can tick this for the items that you do not wish to print price tags from the order.
Then when you try to print price tags for the order it will skip printing price tags for the items "Tag Suppress Print" is ticked.
Please contact email@example.com if you have further issues.