Variants and options are messed up - please help

I’ve been using my shopify store since 2019 and i’m great at uploading new products. today i am unable to have different prices for different tiers of my products and services. what changes were made and how do i add multiple variants? I repeat that I am REALLY good at this already. Today there is a glitch or a change and I am having trouble and it’s getting frustrated after an hour of trying workarounds.