You can create your shopping list on the website or the App! Ensure your planner is set to the week you need to stop for and click on "Shopping List" on the website, or, the "Shopping Cart" Icon on the app. 
Your weeks food will pre-populate on your list. You can then cross of items you don't need, and remove meals if they are not needed—which will remove the ingredients from your shopping list. 

Whilst you can create your list from website or app, to go to check out, this will need to occur via the website by clicking "Shop at Woolworths". 

App: 

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