In this starter solution, inventory changes are logged in the stock transactions table. When you use a portal to Stock Transactions, FileMaker links a new Transactions record to the current Inventory record for you.
If you set up a table view of Stock Transactions for logging inventory changes, you'll need to add a method for linking each new transaction record to the correct inventory record. Add the Stock Transactions::Item ID Match Field directly to this layout so you can apply formatting that will be used when your users input data while in table view. Set it up with a value list that lists Inventory::Item ID Match Field for the first field and Inventory::Description as the second field. When users create a new record, Format the Transactions::Item ID Match Field with a drop down list or pop up menu that uses this value list. Now users can select an item in this field and it will be linked to that inventory record.