Data manager: Line items spanning several lines

So I’m trying enter an invoice in the Data Manager. The invoice contains line-items spanning several lines. For each line item, the description is above the quantity and the unit price is below the line amount.

When I try to label data for 1 line item, the Data manager will see them as seperate lines and create them as seperate lines. I’ve tried setting al the column fields to ‘not-split-item’ and also tried setting them all to multi-line.

When I manually adjust by moving the data to 1 line, the changes are not saved correct. The data manager doesn’t allow for removing the unused line or other mutations. I can adjust the exported JSON, but I’m not sure if that’s wise.

What’s the right path to take?