You can either add or edit General Ledger codes in the "Administration" screen.
Notice that you'll need first to have the relevant access granted.
To edit the default Inventory GL codes scroll down to Defaults, click General. Make the desired changes to the General Ledgers to Inventory line by clicking edit on the 3- dot right menu.
Make the changes on the Value text field. Note that the numbers must be separated by a comma and enclosed into square brackets.
