Does anyone know how I can add items to a quote, or remove items so the item line is deleted from the quote?
You should be able to edit a quote like any other order in your control panel. What are you having problems with?
To delete a line, just put 0 in the Quantity.
Thanks Erik. If I put a 0 in the Quantity, will the item line remain on the quote? Or will it be removed when quote is saved and reopened?
It should remove the line completely. Regardless, it won't be shown on a printed quote.
Lines with zero quantity only hang around in more complex situations, like when you're modifying an order which has already been picked.