I have created a google sheet to store, edit and upload items I am selling on ebay.On third tab I created a calculator. For efficiency I recreated it using app scripts as a sidebar and also added a custom menu.Issue for me is I cannot fiqure out how to add the formula into app script to make the sidebar fully functional.Can anyone one out there show me how to do this?Thank you so much. Link to sheet below.
Here is the sheet - https://docs.google.com/spreadsheets/d/1FXSiNXaMLlWY8tBa-518LmHXMThYHZ3v6G_mQAYvFCo/edit?usp=sharing