Delete all rows in a table?

I am creating a calculator of sorts where the user picks different items along with a quantity. I am using Rollup formula to calculate the total. Is there a way for all the rows to be deleted after the user has copied the total? Here is a screenshot of what it looks like.

I think I would approach the problem differently. Instead of writing a bunch of rows and then deleting them, I would do all of the work in the list of items, and have another table relate to those items to summarize them. Better to read through this and look at this example. It’s a shopping cart style app, but does the same thing and allows you to clear the cart instantly, or edit your selections and quantities.

The shopping cart was designed around the same concept of resetting multiple rows at once, but it also handles quantity as well.

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