How to sum up different amounts for each item?

Hi Community!

I have an unsolved problem that is blowing my brain! Have you felt thist way before?

I am working with product purchases and I need to know the total quantity of each item purchased.

Ex:

ITEM QTY DATE
item1 2 10/10
item2 5 10/10
item1 1 10/11

As you see, the right answer is:

item1 = 3
item 2 = 5

I was trying Rollup, but it’s not working.

What would you do?

Thnx!!

you need to relate items to sold items, then use the rollup column to sum that relation

remember… sum relation, not a lookup, I put lookup there just for better understanding what is in the sold sheet…
you can also use this technique to count sold items, get average or range …

Hi Mate!!

I worked!

Thank you so much!