You can collect sub-items, for example 5-digit codes, under a main item by using Group. Then you can group the table in Prod. codes and see the codes together per main item.
How to do it
Go to Prod. codes.
Set the same group on all the sub-items that belong to the same main item. You set it in the Group field in the edit form (the pencil) on the production code.
Group the table by Group with the Group by button above the table. If you want to see the group as a separate column, turn on Group under Columns.
Open a group to see the sub-items.
Good to know
The main item should not have its own budget if the sub-items have one. Then the amount is counted twice.
Check that heading lines in Excel are not imported as expense items. Remove them before import.
If a heading line has been imported as a separate item, you can correct or delete the item afterwards.

