Prices inputted without VAT.. Master Edit?

I will try explain fully and simply.

I am on woocommerce.. I am setting up a new business…

I don’t need to charge VAT yet, as I am not earning and way below the 85k. Although it would be an advantage to look ‘pro’ selling VAT the reality is I don’t need to start doing so yet. I will just raise my prices 20% so when I do start I can just flip the switch.. But this is the thing, is there a switch?

I hve inputted all 1000+ plus prices with no vat. I have a lot of inputting to do, as I sell a service, so people choose a myriad of options and in my back end for each product there are about 200 prices for each of the 30+ products!! Can you oimagine if i was to go through again adding on 20% to each,.

Is there a “master over-ride” (god that sounds pretentious) wehre I can change all prices in one go just adding 20%?

hope so..

Thaks in advance.