The Store Manager allows to change the product price (tax excluded) and quantity in order section: http://screencast.com/t/m2gbBsag
However you can not change the tax rate, as it is calculated automatically according to the tax settings.
Yes, I know. That's what I said. But what I need is to be able to change the tax rule applied to every item only for that order as well. Would it be doable?
Thank you for your interest.
We are nit planning to add the possibility to change the tax rate - it is calculated automatically according to the tax settings same as at admin.
Please let us know if you have more questions