NOOB needing help with custom field prices please.

[animeexchange]

Hi there.  I had my website built for me by someone else so I am very green so please assume i dont know anything about anything.

I can export a category to change quantities- which is a life saver in terms of time.  But I need to know if there is any way to do something similar to change the price on both the original item and the custom fields?  I have included a screen shot to show what i use at the moment.  my custom drop down on the front end changes between the variants and alters the price accordingly as it should.  But right now if i want to change the prices of the original and 4 variants i have to go into each individual item and change the prices manually.  Now I have 2000+ items with 4 variants each that I need to change prices on and as you can imagine that would take a LONG LONG time.

Any advice would be awesome.  thank you!