Import Custom Pricing Field to Item Creation Form

Hello,
I need help with this please. I have retail and wholesale price for each item. So when creating a new item, i can directly fill in the standard pricing which the retail pricing for me, but to add the wholesale price, I have to go to the pricelist form and add it there. How can i add the wholesale price field to the item form so i get to enter both the prices at once?
Thank you