SSRS line subgrouping by lines and not by columns

Question

I want to have a row subgroup that will act like a head line with the details belonging to each subgroup (see below)

This is what I've done so far

1. Add a parent row group with the field LibelDestinataire as you can see in the picture

2. This is the result I have

Something is wrong but I'm unsure where. I've used a table. I've tried with a matrix but it did not do what I expected.

Any tips are welcomed.

Answer 1

Create a new tablix, right click the details group, select Add Group / Parent Group and use this settings:

You will get a tablix like this:

Delete the left most column (created by the group).

Delete the first row and use the LibelDestinataire field in the selected cell.

Merge the three cell next to the first cell and set the other fields in the next row:

You will get something like this:

In preview it should be something like this:

Apply the color and formats you want to cells and you will get the desired result.

Let me know if this helps.