Revision of Barcode Scanner App

I need to modify my pre-existing barcode scanner app which enable the use of phone camera to retrieve barcode and user input of 8 columns before saving them into an Excel file. The new feature that i need is user has an option to add or remove new columns (other than the default 9 fixed columns). The name of each column should be customizable. All these new column will appear during next barcode scanning page and viewing previous records page. Currently, the main page has 4 buttons and I need to add a "Config" button with a logo. Once the user click on it, they will land on another page which will display newly added columns (default is empty). They can freely add or remove columns (preferable limit the number to 10). The source code will be provided. Thanks!