This page explains how to add a new item to both the purchase list and the master list.
Select the add item button (‘+’):
From the master list, select the add new item button (‘+’):
Enter the name, quantity, price, and set the tax category:
When you are done, select Save:
The new item is added to the purchase list:
The total is updated to reflect the new total including taxes:
The new item was also added to the master list: