Dynamic chart with break-off within data selection

Hello

I'm creating a chart with the fluctuation of 3 different types of prices for multiple groups of items. Users should be able to add lines themselves and the chart should adapt to the amount of rows filled out.

Price types B & C should be in columns, A should be in a line on top of these columns.

Type A however should start on the left side of the item group with last month (9) and move to the right side of the item group this month (10). The line should not move from one item group to another but a new line should start for a new item group.

Attached you will find the latest versions of me trying.
Hope that I'm being clear and thanks in advance!

Thanks, that is looking very promising. Wil investigate and tell you the outcome