Group characteristic values and display text

Hello,

I would like to group some characteristics into a new variable. For this I've used structures without any problem. Now I would like to display the characteristic texts I've grouped.

For exemple I would like:

Group1...Text1

.............Text2

.............Text3

Group2...Text4

.............Text5

When I add into my row selection texts I get as results a repetition of all texts inside all groups, even if I don't have any value:

Group1...Text1

.............Text2

.............Text3

.............Text4

.............Text5

Group2...Text1

.............Text2

.............Text3

.............Text4

.............Text5

Can someone help me?

Thanks,

Benoit