hello everyone, if i need do this, Create a button in SO view mode named 'Add Line Calc' that would initiate the following record operations:

Get the total amount(rate x qty) of the sales order line items

Get the 8.5% of the total amount

Add an item to the line items: internalid:999, quantity = 1, rate = (8.5%total amount) , i need the user event for the button, but the question is , for the operation what type of script i need? to do the process when the user click th button. thanks!!!

Client script to invoke the button press