How do you change shipping amount on invoice?

[Rizza]

How do you change the shipping amount on invoice? I added shipping on a previous invoice and now when I create a new invoice and try to add shipping, the only option is to add the previous shipping I entered. Please help. 

[JJ_]

Hello @Rizza and welcome to the Seller Community 

Shipping may have been created as an Item the first time and in order to get this modified you would need to go to your items and customize the price of your Shipping item there. 

You can also leave the price at 0.00 when editing to create what is called a Variable Pricing Item that will prompt for a price every time is added to an Invoice or Checkout.