How do I make a prestige system

i decided to put off the abbreviation system since at 1 sx it would go into scientic notation but now I don't know how to get the prestige menu what I'm trying to get is a prestige main menu with a requirement of 1 million the formula for the prestige points being (Points)^0.5 and a button within the menu that sends you to the upgrade tree if that is made for me I should be able to make the buttons within that menu