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Hi guys and fellow airtable experts. I am creating an inventory system in airtable with a stock receipt table that will record any changes to my main table's item stocks.  It can be additions if I receive goods and subtractions if I sell away the goods.

Main table has a list of items.

Main table fields:

  • item name
  • stock quantity

Stock Receipt table has a list of stock receipts

Stock Receipt fields:

  • stock receipt name (text)
  • date (date)
  • item name (linked to main table's item name)
  • quantity adjusted (number, can be pos+ or neg-)  

How do I make it so that when a stock receipt is created, airtable automatically compares the stock receipt entry and updates the main table's quantity for that item?

 

E.g. Stock of item was 10. A stock receipt was created with quantity of" -1".  new updated stock of item is now 9.

Given that the two tables are already linked, you can add a rollup field in the "Main Table" that rolls up the "Quantity Adjusted" field in the "Stock Receipt" table, with the formula of `SUM(values)`, and it should do what you're looking for I believe

Given that the two tables are already linked, you can add a rollup field in the "Main Table" that rolls up the "Quantity Adjusted" field in the "Stock Receipt" table, with the formula of `SUM(values)`, and it should do what you're looking for I believe


Thank you for the suggestion. This sounds very taxing and resource intense as every time, the system will have to do a sum of all fields which can hundreds of records. 
Is there a way for a field value to add/ subtract field a field in another table? So everything, a record is added, it updates the linked record in another field.  No need to validate the whole list of records.

E.g. formulas or automation?

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