Subtracting items sold from sales table to inventory available table

[Gillian_Downey]

I am trying to make a simple sales table that will communicate with my inventory table to subtract what is sold and show me how much inventory I have left. I don’t understand most of the lingo…

[Kamille_Parks]

Would you be able to post a screenshot of each table?

[Gillian_Downey]

[Kamille_Parks]

In your Inventory table, add a rollup field that aggregates the Sales table’s {Quantity} field. For the aggregation formula use SUM(values)

Turn your {Amount in Stock} field into a formula field that uses this formula {Quantity Purchased} - {Name of your rollup field}

[Gillian_Downey]

So here’s the roll up field I made…

Then when I put in the formula for quantity in the sales section it says there is an error…

[Gillian_Downey]

omg never mind! I got it!!! THANK YOUUU