Link columns in a ListView

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C#

WPF

Hi!

I´ve a ListView with two columns. In first column (Blocks) I´ve a number of blocks an each block has associated a few movements that are shown in second column (Movements).
I trying to have the next structure:

Block   Movements
              1
1            2
              3

              1
2
              2

I´m going to use an example to give my explanation:
When I select the first block (1) all its associated movements (1,2,3) have to be selected and viceversa, if I select one movement, the block associated has to be selected.
How I can get this?

I hope all is clear. If it isn´t, sorry, It´s my first time.

Regards and thanks.