Create dropdown for groups within the data

[samonedome]

Hi,

I want to create dropdowns for places that have the same name. Here is an example of how my data looks currently:

x
x
x
y
y
y
y
z
z
z
z

<tbody>
</tbody>

However, I want these to become this, where each one can be clicked using a drop down to expand the data within:

x
y
z

<tbody>
</tbody>