Once something is added to a cart, you will have to manually go a remove it from cart. Thats the out of box functionality and we shouldn't change it
Also you can't save progress of an order guide. We had similar requirement, but we had to use another appraoch of creating a custom table with buttons Previous Next and Save Progress. We gave user option to save their record. And at the end of the page, a submit button, which will create a Request for them.
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