google sheets - manual entries to cells in column A become the list source for autocomplete in column B

[aonefun]

i am new to google sheets - wondering how i can achieve the following: create a master shoping list of manual entries into cells of column A. Then, when i want to create the current week's shopping list i would type any keyword in the cells of column B and there would be an autocomplete dropdown of choices based on the entries in column A. thank you!