How to change EU sizes to US with automation fulfillment?

Hi guys

I cant seem to find out how to sync my sizing orders because my supplier sells shoes in EURO sizing and on my website I sell mine in US sizes. For example the size 44-45 EURO… is size 10 and 11 US sizing. On CJ I cannot connect two US sizes to one EURO size. So I am unsure how to automate my orders.